qa: workunits: mon: crush_ops: test 'ceph osd crush move'

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
(cherry picked from commit 3bc618b7b46496c5110edde0da9cae5d3e68e0e1)
mon/OSDMonitor: fix 'ceph osd crush reweight ...'

The adjust method returns a count of adjusted items.

Add a test.

Fixes: #6382
Backport: dumpling
Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>
(cherry picked from commit 3de32562b55c6ece3a6ed783c36f8b9f21460339)