[Bug 1717404] [NEW] IPv6 support regresses with nplan transition

[Stéphane Graber]

Public bug reported:

Prior to the switch to nplan, systems (in my case containers) would DHCP
for IPv4 and let the kernel do IPv6 auto-configuration whenever a router
advertisement comes in.

That's the exact same behavior we see on every single other Linux
distribution, but ever since the switch to nplan by default in Ubuntu,
we're not getting an IPv6 address anymore when a RA reaches the
container.

This was spotted by a new Jenkins test we're running which ensures that
every single image we have for LXD will start and get a working IPv4
(through DHCP) and IPv6 address (through RA).


```
PASS: alpine-33-priv has working IPv4 and IPv6 connectivty
PASS: alpine-33-unpriv has working IPv4 and IPv6 connectivty
PASS: alpine-34-priv has working IPv4 and IPv6 connectivty
PASS: alpine-34-unpriv has working IPv4 and IPv6 connectivty
PASS: alpine-35-priv has working IPv4 and IPv6 connectivty
PASS: alpine-35-unpriv has working IPv4 and IPv6 connectivty
PASS: alpine-36-priv has working IPv4 and IPv6 connectivty
PASS: alpine-36-unpriv has working IPv4 and IPv6 connectivty
PASS: alpine-edge-priv has working IPv4 and IPv6 connectivty
PASS: alpine-edge-unpriv has working IPv4 and IPv6 connectivty
PASS: archlinux-priv has working IPv4 and IPv6 connectivty
PASS: archlinux-unpriv has working IPv4 and IPv6 connectivty
PASS: centos-6-priv has working IPv4 and IPv6 connectivty
PASS: centos-6-unpriv has working IPv4 and IPv6 connectivty
PASS: centos-7-priv has working IPv4 and IPv6 connectivty
PASS: centos-7-unpriv has working IPv4 and IPv6 connectivty
PASS: debian-buster-priv has working IPv4 and IPv6 connectivty
PASS: debian-buster-unpriv has working IPv4 and IPv6 connectivty
PASS: debian-jessie-priv has working IPv4 and IPv6 connectivty
PASS: debian-jessie-unpriv has working IPv4 and IPv6 connectivty
PASS: debian-sid-priv has working IPv4 and IPv6 connectivty
PASS: debian-sid-unpriv has working IPv4 and IPv6 connectivty
PASS: debian-stretch-priv has working IPv4 and IPv6 connectivty
PASS: debian-stretch-unpriv has working IPv4 and IPv6 connectivty
PASS: debian-wheezy-priv has working IPv4 and IPv6 connectivty
PASS: debian-wheezy-unpriv has working IPv4 and IPv6 connectivty
PASS: fedora-24-priv has working IPv4 and IPv6 connectivty
PASS: fedora-24-unpriv has working IPv4 and IPv6 connectivty
PASS: fedora-25-priv has working IPv4 and IPv6 connectivty
PASS: fedora-25-unpriv has working IPv4 and IPv6 connectivty
PASS: fedora-26-priv has working IPv4 and IPv6 connectivty
PASS: fedora-26-unpriv has working IPv4 and IPv6 connectivty
PASS: gentoo-priv has working IPv4 and IPv6 connectivty
PASS: gentoo-unpriv has working IPv4 and IPv6 connectivty
PASS: opensuse-422-priv has working IPv4 and IPv6 connectivty
PASS: opensuse-422-unpriv has working IPv4 and IPv6 connectivty
PASS: opensuse-423-priv has working IPv4 and IPv6 connectivty
PASS: opensuse-423-unpriv has working IPv4 and IPv6 connectivty
PASS: oracle-6-priv has working IPv4 and IPv6 connectivty
PASS: oracle-6-unpriv has working IPv4 and IPv6 connectivty
PASS: oracle-7-priv has working IPv4 and IPv6 connectivty
PASS: oracle-7-unpriv has working IPv4 and IPv6 connectivty
PASS: plamo-5x-priv has working IPv4 and IPv6 connectivty
PASS: plamo-5x-unpriv has working IPv4 and IPv6 connectivty
PASS: plamo-6x-priv has working IPv4 and IPv6 connectivty
PASS: plamo-6x-unpriv has working IPv4 and IPv6 connectivty
PASS: sabayon-priv has working IPv4 and IPv6 connectivty
PASS: sabayon-unpriv has working IPv4 and IPv6 connectivty
FAIL: ubuntu-artful-priv doesn't have an IPv6 address
FAIL: ubuntu-artful-unpriv doesn't have an IPv6 address
PASS: ubuntu-core-16-priv has working IPv4 and IPv6 connectivty
PASS: ubuntu-core-16-unpriv has working IPv4 and IPv6 connectivty
PASS: ubuntu-precise-priv has working IPv4 and IPv6 connectivty
PASS: ubuntu-precise-unpriv has working IPv4 and IPv6 connectivty
PASS: ubuntu-trusty-priv has working IPv4 and IPv6 connectivty
PASS: ubuntu-trusty-unpriv has working IPv4 and IPv6 connectivty
PASS: ubuntu-xenial-priv has working IPv4 and IPv6 connectivty
PASS: ubuntu-xenial-unpriv has working IPv4 and IPv6 connectivty
PASS: ubuntu-zesty-priv has working IPv4 and IPv6 connectivty
PASS: ubuntu-zesty-unpriv has working IPv4 and IPv6 connectivty

Test failed
```

** Affects: nplan (Ubuntu)
     Importance: High
         Status: New

** Changed in: nplan (Ubuntu)
   Importance: Critical => High

-- 
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https://bugs.launchpad.net/bugs/1717404

Title:
  IPv6 support regresses with nplan transition

Status in nplan package in Ubuntu:
  New

Bug description:
  Prior to the switch to nplan, systems (in my case containers) would
  DHCP for IPv4 and let the kernel do IPv6 auto-configuration whenever a
  router advertisement comes in.

  That's the exact same behavior we see on every single other Linux
  distribution, but ever since the switch to nplan by default in Ubuntu,
  we're not getting an IPv6 address anymore when a RA reaches the
  container.

  This was spotted by a new Jenkins test we're running which ensures
  that every single image we have for LXD will start and get a working
  IPv4 (through DHCP) and IPv6 address (through RA).

  
  ```
  PASS: alpine-33-priv has working IPv4 and IPv6 connectivty
  PASS: alpine-33-unpriv has working IPv4 and IPv6 connectivty
  PASS: alpine-34-priv has working IPv4 and IPv6 connectivty
  PASS: alpine-34-unpriv has working IPv4 and IPv6 connectivty
  PASS: alpine-35-priv has working IPv4 and IPv6 connectivty
  PASS: alpine-35-unpriv has working IPv4 and IPv6 connectivty
  PASS: alpine-36-priv has working IPv4 and IPv6 connectivty
  PASS: alpine-36-unpriv has working IPv4 and IPv6 connectivty
  PASS: alpine-edge-priv has working IPv4 and IPv6 connectivty
  PASS: alpine-edge-unpriv has working IPv4 and IPv6 connectivty
  PASS: archlinux-priv has working IPv4 and IPv6 connectivty
  PASS: archlinux-unpriv has working IPv4 and IPv6 connectivty
  PASS: centos-6-priv has working IPv4 and IPv6 connectivty
  PASS: centos-6-unpriv has working IPv4 and IPv6 connectivty
  PASS: centos-7-priv has working IPv4 and IPv6 connectivty
  PASS: centos-7-unpriv has working IPv4 and IPv6 connectivty
  PASS: debian-buster-priv has working IPv4 and IPv6 connectivty
  PASS: debian-buster-unpriv has working IPv4 and IPv6 connectivty
  PASS: debian-jessie-priv has working IPv4 and IPv6 connectivty
  PASS: debian-jessie-unpriv has working IPv4 and IPv6 connectivty
  PASS: debian-sid-priv has working IPv4 and IPv6 connectivty
  PASS: debian-sid-unpriv has working IPv4 and IPv6 connectivty
  PASS: debian-stretch-priv has working IPv4 and IPv6 connectivty
  PASS: debian-stretch-unpriv has working IPv4 and IPv6 connectivty
  PASS: debian-wheezy-priv has working IPv4 and IPv6 connectivty
  PASS: debian-wheezy-unpriv has working IPv4 and IPv6 connectivty
  PASS: fedora-24-priv has working IPv4 and IPv6 connectivty
  PASS: fedora-24-unpriv has working IPv4 and IPv6 connectivty
  PASS: fedora-25-priv has working IPv4 and IPv6 connectivty
  PASS: fedora-25-unpriv has working IPv4 and IPv6 connectivty
  PASS: fedora-26-priv has working IPv4 and IPv6 connectivty
  PASS: fedora-26-unpriv has working IPv4 and IPv6 connectivty
  PASS: gentoo-priv has working IPv4 and IPv6 connectivty
  PASS: gentoo-unpriv has working IPv4 and IPv6 connectivty
  PASS: opensuse-422-priv has working IPv4 and IPv6 connectivty
  PASS: opensuse-422-unpriv has working IPv4 and IPv6 connectivty
  PASS: opensuse-423-priv has working IPv4 and IPv6 connectivty
  PASS: opensuse-423-unpriv has working IPv4 and IPv6 connectivty
  PASS: oracle-6-priv has working IPv4 and IPv6 connectivty
  PASS: oracle-6-unpriv has working IPv4 and IPv6 connectivty
  PASS: oracle-7-priv has working IPv4 and IPv6 connectivty
  PASS: oracle-7-unpriv has working IPv4 and IPv6 connectivty
  PASS: plamo-5x-priv has working IPv4 and IPv6 connectivty
  PASS: plamo-5x-unpriv has working IPv4 and IPv6 connectivty
  PASS: plamo-6x-priv has working IPv4 and IPv6 connectivty
  PASS: plamo-6x-unpriv has working IPv4 and IPv6 connectivty
  PASS: sabayon-priv has working IPv4 and IPv6 connectivty
  PASS: sabayon-unpriv has working IPv4 and IPv6 connectivty
  FAIL: ubuntu-artful-priv doesn't have an IPv6 address
  FAIL: ubuntu-artful-unpriv doesn't have an IPv6 address
  PASS: ubuntu-core-16-priv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-core-16-unpriv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-precise-priv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-precise-unpriv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-trusty-priv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-trusty-unpriv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-xenial-priv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-xenial-unpriv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-zesty-priv has working IPv4 and IPv6 connectivty
  PASS: ubuntu-zesty-unpriv has working IPv4 and IPv6 connectivty

  Test failed
  ```

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