Add a function to clone map and use it where appropriate #3028

Job	Run time
Code (oldstable)	1m 53s
Client (oldstable, ubuntu-latest)	57s
Documentation	3m 54s
Code (stable)	1m 35s
Client (oldstable, macos-latest)	1m 13s
Code (tip)	3m 54s
Client (oldstable, windows-latest)	2m 10s
Client (stable, ubuntu-latest)	57s
System (stable, cluster, dir)	2m 2s
Client (stable, macos-latest)	55s
System (stable, cluster, btrfs)	3m 47s
Client (stable, windows-latest)	2m 4s
System (stable, cluster, lvm)	3m 54s
System (stable, cluster, zfs)	2m 48s
System (stable, cluster, ceph)	3m 16s
System (stable, cluster, random)	3m 26s
System (stable, standalone, dir)	2m 7s
System (stable, standalone, btrfs)	3m 19s
System (stable, standalone, lvm)	2m 8s
System (stable, standalone, zfs)	3m 21s
System (stable, standalone, ceph)	3m 22s
System (stable, standalone, random)	2m 4s
System (oldstable, cluster, dir)	2m 13s
System (oldstable, standalone, dir)	2m 6s
System (tip, cluster, dir)	3m 47s
System (tip, standalone, dir)	3m 53s
	1h 7m 5s

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