osd: add and utilize OSD_FIXED_COLLECTION_LIST feature

osd: add and utilize OSD_FIXED_COLLECTION_LIST feature

If all osds from upacting set have this feature set
the backend can use the new "fixed" collection_list method,
otherwise it fallbacks to the legacy method.

Signed-off-by: Mykola Golub <mgolub@suse.com>
(cherry picked from commit 8f9d335bc7cccb221ca7316ee0c8f22198d0f9ef)

Conflicts:
	src/include/ceph_features.h: trivial
	src/osd/PGBackend.h: trivial
	src/osd/PrimaryLogPG.h: PG::get_min_upacting_features instead of
				PeeringState::get_min_upacting_features