shared/idmap: Remove GetSet #320

Job	Run time
Documentation	6m 17s
Code	1m 24s
System (1.20.x, cluster, dir)	2m 41s
Client (1.20.x, ubuntu-latest)	58s
System (1.20.x, cluster, btrfs)	1m 34s
Client (1.20.x, macos-latest)	1m 40s
System (1.20.x, cluster, lvm)	1m 38s
Client (1.20.x, windows-latest)	2m 16s
System (1.20.x, cluster, zfs)	2m 38s
System (1.20.x, cluster, ceph)	1m 40s
System (1.20.x, cluster, random)	1m 35s
System (1.20.x, standalone, dir)	1m 36s
System (1.20.x, standalone, btrfs)	1m 42s
System (1.20.x, standalone, lvm)	1m 38s
System (1.20.x, standalone, zfs)	1m 31s
System (1.20.x, standalone, ceph)	1m 57s
System (1.20.x, standalone, random)	1m 36s
System (stable, cluster, dir)	1m 11s
System (stable, standalone, dir)	2m 31s
System (tip, cluster, dir)	1m 58s
System (tip, standalone, dir)	1m 49s
	41m 50s

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