osdc/Objecter: fix split vs reconnect race

osdc/Objecter: fix split vs reconnect race

If we are reconnecting to an OSD, we may not have a connection established
so this feature check is completely unreliable.  If there happens to be a
split, that could mean we don't resend an op that should have been resent.

Instead, we can infer the OSD has the new behavior if require_osd_release
is luminous or later.  If not, we can look at the per-osd features in the
OSDMap.

Fixes: http://tracker.ceph.com/issues/22544
Signed-off-by: Sage Weil <sage@redhat.com>
(cherry picked from commit 917fdbe5422d099902aaa08b3406efc0247ef155)