[Bug 1720397] Re: qemu-kvm doesnt restart after node reboot

[ChristianEhrhardt]

In the meantime also regression checks on the ppa completed.
Given the nature of the change nothing was expected, but better to confirm and it was ok not showing new issues.

That said uploading to Artful-proposed for evaluation of the release
team if we want to push as-is, 0-day update or whatever else.

SRU to zesty after that completed.

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https://bugs.launchpad.net/bugs/1720397

Title:
  qemu-kvm doesnt restart after node reboot

Status in Ubuntu Cloud Archive:
  New
Status in qemu package in Ubuntu:
  In Progress
Status in qemu source package in Zesty:
  Confirmed
Status in qemu source package in Artful:
  In Progress

Bug description:
  [Impact]

   * Since the Zesty Merge the qemu-kvm service fails to be active by 
     default.

   * It is a non required but rather useful helper, so it should be fixed to 
     be enabled as it was pre zesty due to systemd-generators taking it from 
     sysv scripts back then.

  [Test Case]

   * Install qemu-system-common
   * Then check
     $ systemctl status qemu-kvm
   * This should be active (exited) but is currently disabled

  [Regression Potential]

   * If this script causes any issue for someone (not known so far) and he 
     was running on zesty a while it will on the SRU update be enabled and 
     trigger these issues. Yet this is a generic argument and if that would 
     be a blocker no services would be allowed to be enabled. I verified 
     that if masked the service stays off as it should.

  [Other Info]
   
   * IMO this issue qualified for  (2) the following of the Final Freeze:
     2) Bug fixes that would be suitable for post-release SRUs, which we
     may choose to accept, reject, or shunt to -updates for 0-day SRUs
     on a case-by-base basis.

  --

  
  Upon a MAAS reboot openstack nova-compute services come up blocked with the following message in juju status:

  Services not running that should be: qemu-kvm

  services qemu-kvm status shows the services as dead
  services qemu-kvm restart fixes issue.

  ubuntu at fair-dingo:~$ service qemu-kvm status
  ● qemu-kvm.service - QEMU KVM preparation - module, ksm, hugepages
     Loaded: loaded (/lib/systemd/system/qemu-kvm.service; disabled; vendor preset: enabled)
     Active: active (exited) since Thu 2017-09-28 19:54:17 UTC; 3min 20s ago
    Process: 33714 ExecStart=/usr/share/qemu/init/qemu-kvm-init start (code=exited, status=0/SUCCESS)
   Main PID: 33714 (code=exited, status=0/SUCCESS)

  Linux MaaS 4.4.0-96-generic #119-Ubuntu SMP Tue Sep 12 14:59:54 UTC
  2017 x86_64 x86_64 x86_64 GNU/Linux

  Juju 2.2.4-xenial-amd64

  openstack 3.12.0

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