Fix TPM with long instance names #2994

Job	Run time
Code (oldstable)	7m 31s
Code (stable)	7m 55s
Code (tip)	10m 24s
Client (oldstable, ubuntu-latest)	48s
Client (oldstable, macos-latest)	46s
System (stable, cluster, dir)	12m 23s
Client (oldstable, windows-latest)	1m 30s
System (stable, cluster, btrfs)	13m 12s
Client (stable, ubuntu-latest)	50s
System (stable, cluster, lvm)	14m 20s
Client (stable, macos-latest)	52s
System (stable, cluster, zfs)	12m 32s
Client (stable, windows-latest)	1m 13s
System (stable, cluster, ceph)	17m 59s
System (stable, cluster, random)	13m 6s
Documentation	5m 27s
System (stable, standalone, dir)	23m 50s
System (stable, standalone, btrfs)	21m 52s
System (stable, standalone, lvm)	44m 5s
System (stable, standalone, zfs)	38m 28s
System (stable, standalone, ceph)	1h 15m 53s
System (stable, standalone, random)	22m 40s
System (oldstable, cluster, dir)	11m 38s
System (oldstable, standalone, dir)	22m 13s
System (tip, cluster, dir)	16m 29s
System (tip, standalone, dir)	24m 59s
	7h 2m 55s

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