[Bug 1300481] [NEW] cgroups-umount must ignore rmdir failure

[Serge Hallyn]

Public bug reported:

when cgroup-lite is uninstalled or stopped, it runs cgroups-umount.
This unmounts /sys/fs/cgroup/$controller and tries to rmdir it.  However
if any task has unshared the mounts namespace after cgroup-lite started,
it will continue to have /sys/fs/cgroup/$controller mounted, preventing
the rmdir.

The rmdir should simply be ignored, as the directory will simply go away
after the next reboot, and is harmless in the meantime.

** Affects: cgroup-lite (Ubuntu)
     Importance: High
     Assignee: Serge Hallyn (serge-hallyn)
         Status: Triaged

** Changed in: cgroup-lite (Ubuntu)
   Importance: Undecided => High

** Changed in: cgroup-lite (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1300481

Title:
  cgroups-umount must ignore rmdir failure

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