PG: _remove_pg, reset info.last_update and info.log_tail on log zero
PG: _remove_pg, reset info.last_update and info.log_tail on log zero

Signed-off-by: Samuel Just <4c46b94684b338bae1ed5e7e1321718dd75401cc@dreamhost.com>

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