- set_osc_active becomes ptlrpc_set_import_active (though it still only works on

- set_osc_active becomes ptlrpc_set_import_active (though it still only works on
OSCs) and is automatically called for non-recoverable OSCs before we invoke the
upcall. (part of b=1038)
- When aborting recovery, shut down the recovery timer, abort the recovery
queue's requests, and don't do it twice.
- Make sure we call obd_disconnect correctly for all non-lctl imports when
aborting recovery or forcing shutdown, so that we don't leave the last_rcvd bits
around for the next time.
- Fix leak of last_rcvd-spawn exports (every one!).
- Get and put exports for recovery-queued requests and replies, so that
  we don't race badly with teardown.