rgw: don't enable all zone features by default

rgw: don't enable all zone features by default

on zonegroup creation, all `supported` features get enabled by default.
however, some features should remain opt-in. add a separate list of
`enabled` features for the subset of features we want enabled by default
on zonegroup creation

Signed-off-by: Casey Bodley <cbodley@redhat.com>
(cherry picked from commit cdb1be836cc1b8c2e8f178bc00bad24d2b8413bf)

Conflicts:
	src/rgw/driver/rados/rgw_zone.cc no create_default_zonegroup()