Fix random ETag values due to map ordering #3120

Job	Run time
Code (oldstable)	7m 50s
Code (stable)	7m 37s
Client (oldstable, ubuntu-latest)	1m 9s
Code (tip)	10m 27s
Client (oldstable, macos-latest)	55s
Documentation	5m 4s
Client (oldstable, windows-latest)	1m 19s
Client (stable, ubuntu-latest)	1m 9s
Client (stable, macos-latest)	55s
System (stable, cluster, dir)	13m 24s
Client (stable, windows-latest)	2m 42s
System (stable, cluster, btrfs)	12m 33s
System (stable, cluster, lvm)	12m 49s
System (stable, cluster, zfs)	12m 21s
System (stable, cluster, ceph)	16m 36s
System (stable, cluster, random)	14m 50s
System (stable, standalone, dir)	22m 20s
System (stable, standalone, btrfs)	22m 9s
System (stable, standalone, lvm)	40m 25s
System (stable, standalone, zfs)	39m 17s
System (stable, standalone, ceph)	1h 17m 11s
System (stable, standalone, random)	23m 28s
System (oldstable, cluster, dir)	11m 54s
System (oldstable, standalone, dir)	22m 12s
System (tip, cluster, dir)	14m 36s
System (tip, standalone, dir)	25m 7s
	7h 0m 19s

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