incusd/instance/lxc: Handle OCI containers using real PID1 #2164

Job	Run time
Documentation	4m 16s
Client (oldstable, ubuntu-latest)	59s
Code (oldstable)	7m 23s
Client (oldstable, macos-latest)	52s
System (stable, cluster, dir)	11m 43s
Code (stable)	7m 43s
Client (oldstable, windows-latest)	2m 47s
System (stable, cluster, btrfs)	12m 44s
Code (tip)	10m 52s
Client (stable, ubuntu-latest)	1m 5s
System (stable, cluster, lvm)	13m 43s
Client (stable, macos-latest)	1m 7s
System (stable, cluster, zfs)	13m 10s
Client (stable, windows-latest)	2m 28s
System (stable, cluster, ceph)	16m 27s
System (stable, cluster, random)	13m 10s
System (stable, standalone, dir)	21m 54s
System (stable, standalone, btrfs)	22m 27s
System (stable, standalone, lvm)	39m 34s
System (stable, standalone, zfs)	40m 24s
System (stable, standalone, ceph)	1h 14m 19s
System (stable, standalone, random)	22m 55s
System (oldstable, cluster, dir)	12m 34s
System (oldstable, standalone, dir)	21m 43s
System (tip, cluster, dir)	15m 29s
System (tip, standalone, dir)	25m 38s
	6h 57m 26s

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