Merge PR #33523 into master

* refs/pull/33523/head:
	mgr/orch: ServiceSpec: drop 'count'
	mgr/rook: use spec.placement.count (instead of spec.count)
	mgr/cephadm: make HostAssignment make sense
	mgr/orch: PlacementSpec: do not combine all_hosts with anything else
	mgr/orch: use PlacementSpec.from_strings() for all CLI commands

Reviewed-by: Joshua Schmid <jschmid@suse.de>