The more controversial changes, although my tree finally works:

The more controversial changes, although my tree finally works:

- if the enqueue_lock RPC doesn't return an immediately granted lock, go to
  sleep
- when the callback RPC is received, wake that process up
- LBUG if we try to free a lock that still has children
- set the completion_ast at the end of local_lock_enqueue, to avoid doing a
  spurious RPC in the case of an immediately granted lock
- removed ldlm_server_conn, in favour of using the MDS/OST connections that
  already exist.
- don't do remote locking RPCs if the lock is managed locally
- fixed some osc_setup error cases
- create a namespace at mount time