[Bug 1812680] [NEW] gre tunnels are down after netplan apply

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After configuring gre tunnels via netplan the tunX devices are in the
state down. I need to manually bring them up in order to have
connectivity with another end of the tunnel.

Netplan file:

network:
  version: 2
  renderer: networkd
  tunnels:
    tun0:
      mode: gre
      local: 1.1.1.1
      remote: 2.2.2.2
      addresses:
        - 10.7.10.50/30
    tun1:
      mode: gre
      local: 3.3.3.3
      remote: 4.4.4.4
      addresses:
        - 10.7.10.54/30


Output of ip a:
16: tun1 at NONE: <POINTOPOINT,NOARP> mtu 1476 qdisc noop state DOWN group default qlen 1000
    link/gre 1.1.1.1 peer 2.2.2.2
    inet 10.7.10.54/30 brd 10.7.10.55 scope global tun1
       valid_lft forever preferred_lft forever
17: tun0 at NONE: <POINTOPOINT,NOARP> mtu 1476 qdisc noop state DOWN group default qlen 1000
    link/gre 3.3.3.3 peer 4.4.4.4
    inet 10.7.10.50/30 brd 10.7.10.51 scope global tun0
       valid_lft forever preferred_lft forever


Netplan version: 0.95-1
Systemd: 237

Networkd config files:
 cat 10-netplan-tun0*
[NetDev]
Name=tun0
Kind=gre

[Tunnel]
Independent=true
Local=1.1.1.1
Remote=2.2.2.2

[Match]
Name=tun0

[Network]
LinkLocalAddressing=ipv6
Address=10.7.10.50/30
ConfigureWithoutCarrier=yes

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: gre tun tunnels
-- 
gre tunnels are down after netplan apply
https://bugs.launchpad.net/bugs/1812680
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