Tests

Refactor scriptlet loader and improve checks #3295

Job	Run time
Client (oldstable, ubuntu-latest)	20s
Client (oldstable, macos-latest)	30s
Client (oldstable, windows-latest)	53s
Client (stable, ubuntu-latest)	26s
Client (stable, macos-latest)	33s
Client (stable, windows-latest)	2m 14s
Code (oldstable)	7m 37s
Code (stable)	7m 40s
Code (tip)	10m 28s
System (stable, cluster, dir)	12m 0s
System (stable, cluster, btrfs)	12m 30s
System (stable, cluster, lvm)	13m 9s
Documentation	5m 4s
System (stable, cluster, zfs)	13m 55s
System (stable, cluster, ceph)	16m 9s
System (stable, cluster, random)	13m 42s
System (stable, standalone, dir)	22m 34s
System (stable, standalone, btrfs)	22m 6s
System (stable, standalone, lvm)	41m 49s
System (stable, standalone, zfs)	40m 9s
System (stable, standalone, ceph)	1h 16m 32s
System (stable, standalone, random)	23m 15s
System (oldstable, cluster, dir)	12m 17s
System (oldstable, standalone, dir)	26m 10s
System (tip, cluster, dir)	15m 46s
System (tip, standalone, dir)	24m 45s
	7h 2m 33s

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