in RHOSO, we have returned a recursive change of nova's ownership to /var/lib/nova. That brings back a 6 y.o. tripleo issue with NFS backend https://bugs.launchpad.net/tripleo/+bug/1778465

The quick fix was to port the tripleo solution, which is suboptimal and brings back legacy DF in. Based on

Sean's inputs:

we can filter the ownership of the file but there are only 2 valiald users/groups for files in /var/lib/nova

nova or qemu, everything else is incorrect.

the provided script is overly complicated which is why i did not want to port this when i was rewriting this role originally.

i explicitly made sure to remove all of the usage of init container too so i condier this patch to be introducing a regiession on 2 front.
it does not enforce the ownership to be either nova or qemu
it readdes init containers which were intentionally remvoed.