zfs: load keys for encrypted datasets during pool import #3050

Job	Run time
Code (oldstable)	7m 44s
Documentation	5m 28s
Client (oldstable, ubuntu-latest)	1m 0s
Code (stable)	7m 32s
Client (oldstable, macos-latest)	1m 1s
Code (tip)	10m 35s
Client (oldstable, windows-latest)	2m 27s
System (stable, cluster, dir)	13m 53s
Client (stable, ubuntu-latest)	1m 12s
System (stable, cluster, btrfs)	12m 9s
Client (stable, macos-latest)	1m 42s
System (stable, cluster, lvm)	13m 22s
Client (stable, windows-latest)	2m 17s
System (stable, cluster, zfs)	12m 38s
System (stable, cluster, ceph)	16m 12s
System (stable, cluster, random)	11m 38s
System (stable, standalone, dir)	23m 6s
System (stable, standalone, btrfs)	23m 39s
System (stable, standalone, lvm)	38m 22s
System (stable, standalone, zfs)	34m 7s
System (stable, standalone, ceph)	38m 20s
System (stable, standalone, random)	24m 58s
System (oldstable, cluster, dir)	12m 11s
System (oldstable, standalone, dir)	23m 53s
System (tip, cluster, dir)	14m 42s
System (tip, standalone, dir)	26m 32s
	6h 20m 40s

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