PG: clear peering flag when we transition from Peering to Reset
PG: clear peering flag when we transition from Peering to Reset

This is safe because the only other transitions are to Pending (still
peering) and Active, which clears the state itself.

Signed-off-by: Josh Durgin <51652c783f70f5b272ebd02f1fd20d3af7a2449f@dreamhost.com>

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