- Chain imports on connection, like exports.

- Chain imports on connection, like exports.
- Need to be able to go import->obd during recovery.
- Rename mdc to cli in client_obd_connect so that I don't get confused as
  often.
- Use ptlrpc_req_finished instead of ptlrpc_free_req in a few places where
  we need to keep the request around for possible replay during recovery.
- Flag opens as needing replay.
- Rewrite request address and cookie during replay and resend, to handle
  the recovery case (the connection handle changes when the server reboots,
  for example).
- ll_reconnect now correctly reconnects with a new server (possibly with
  a new server UUID).  Tested for MDS, "obviously correct" for OST as well.
- no more references to mdc_getstatus or sbi2mdc in the (now fs-distinct)
  ll_reconnect_recover code.

We can now successfully reconnect to a rebooted MDS and begin replay.
Need more work (on MDS or client, not clear yet) to make the replay
succeed.