osd: skip degraded objects we're already recoverying in recover_replicas
osd: skip degraded objects we're already recoverying in recover_replicas

Otherwise we'll start_recovery_op, dup the push, etc.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph