system default python is now usually python3 - better make our code
compliant with it
`ceph` CLI itself has some slightly different usage and outputs
jq used instead of cut in a few places, because was easier to work out
what the original commands were intending to grab, now that those
outputs have moved location. Yes, jq is a new dependency for some of
the plugins, but it was already implicitly depended upon in ceph_osd
plugin
