qa/tasks/ceph_manager.py: improve loggings

qa/tasks/ceph_manager.py: improve loggings

1. When `test_pool_min_size` hit the case where
`not all PGs are active or peered` we dump
each PG state that doesn't have active or
peered state

2. Improve logs message in `inject_pause()`.

3. Add logs for the `test_map_discontinuity()`.

4. In the function, `choose_action()`,
added more logs regarding `chance_down`.

5. Added more loggings to
`primary_affinity()`,
`thrash_pg_upmap_items()`,
`thrash_pg_upmap()`.

6. Make self.is_clean() dump the pgs that
are not active+clean.

Signed-off-by: Kamoltat <ksirivad@redhat.com>