qa/suites/upgrade: ignore osd in unknown state

qa/suites/upgrade: ignore osd in unknown state

The thrashosds task is occasionally restarting OSDs and mon/mgr log
warnings are wrongly flagging this as a problem.

Fixes: https://tracker.ceph.com/issues/76747
Signed-off-by: Patrick Donnelly <pdonnell@ibm.com>
(cherry picked from commit a1430973f2c3e8758890447a1de3b906da77b60e)

Conflicts:
    qa/suites/upgrade/reef-x/stress-split/1-start.yaml
    qa/suites/upgrade/squid-x/stress-split/1-start.yaml
Resolution: different upgrade suites, just add the change manually