mgr/cephadm: allow activation of OSDs that have previously started

mgr/cephadm: allow activation of OSDs that have previously started

When this code was introduced way back in ea987a0e56db106f7c76d11f86b3e602257f365e,
for some reason I was focused only on freshly created OSDs.  The
get_osd_uuid_map() helper is used by deploy_osd_daemons_for_existing_osds()
which is called not only by OSD creation but also by 'ceph cephadm
osd activate', which is meant to instantiate daemons for existing OSD
devices (e.g., devices that were reattached to a new server, or whose
/var/lib/ceph/$fsid/osd.$id directory was lost for some other reason.
However, if we ignore OSDs with up_from > 0, then we can't recreate a
daemon instance for such existing OSDs--arguably the most important ones,
since they may hold real data.

Fixes: https://tracker.ceph.com/issues/53491
Signed-off-by: Sage Weil <sage@newdream.net>