Fix recovery underpinnings:

Fix recovery underpinnings:
 - Store the client's UUID (from last_rcvd) in exp_client_uuid, so
   target_handle_connect can match it up.
 - Don't obd_connect if target_handle_reconnect matched us up with an existing
   export.
 - Don't invalidate everything so eagerly: only if we can't recover and it
   wasn't a partition-reconnect.
 - Clear the in-recovery flag before we send clients their delayed replies.
 - Add "force" argument to lctl cleanup, and remove it from detach.
 - Use new lmc API for recovery-small.sh (more test cleanup coming).