Fixes: #13167
Previously, the mgr did not honor the flag
ContinueUpgradeAfterChecksEvenIfNotHealthy
from the cluster spec. Only osd, mds, and rgw did.
To render the update behavior correct and complete across the daemons, this
change implements the honoring of the flag for the mgr.
Signed-off-by: Michael Adam <obnox@samba.org>