qa: missing even trivial tests for many commands
I wrote a trivial script to look for missing commands in tests (https://github.com/ceph/ceph/pull/15675/commits/3aad0f89d527da2d3c995945453276dc7366c954) and it popped up several in RADOS:
osd cluster_snap (although this one's disabled anyway)
osd tier rm
perf histogram dump
These don't have even the most trivial invocation present!