most of the work for lock replay:

most of the work for lock replay:
  - add a dlm replay flag that:
    - prevents the calling of policy functions
    - tells the server to trust the client's judgement
  - a function to call ldlm_cli_enqueue for replay

next up:
  - something to help replay _all_ locks in a given namespace, probably in
    the form of some generic ldlm_namespace_foreach thing