[Bug 1656280] Re: Support installing subordinate systemd on Ubuntu Desktop 14.04.5

[Dimitri John Ledkov]

Slight change of implementation; indicator-datetime nor xorg-server-lts-
xenial srus are no longer strictly needed (even though both are correct)

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Title:
  Support installing subordinate systemd on Ubuntu Desktop 14.04.5

Status in systemd package in Ubuntu:
  Invalid
Status in systemd source package in Trusty:
  Triaged

Bug description:
  Add support for installing subordinate systemd for snappy on Ubuntu
  Desktop 14.04.5

  When installed, superseeds systemd-shim support functionality by:
  * Providing necessary units for power management
  * Replicating systemd-shim timedated support functionality in timedated itself (thus dropping systemd-shim dependency from timedated code)

  Bugfixes to cgmanager codepath for compatibility with lxc:
  * free NULL bug fix
  * fix cg_attach for subordinate systemd

  [Impact]

   * Users can install snapd without regressing Desktop support,
  lxc/lxc1/lxd abilities.

  [Test Case]

   * Power management works (e.g. shutdown/reboot via indicator-system)

   * Timedatectl commands report NTP status enable/disabled correctly,
  and can change it

   * Can install and use snapd

   * Can install and use lxc / lxc1 / lxd

  [Regression Potential]

   * Installing snapd will pull in cgmanager and bin:systemd on the
  desktop, superseding systemd-shim. Thus things that rely on systemd-
  shim implementations may regress.

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