nfs4: implement missing RECLAIM_COMPLETE

make client recovery possible.

Acked-by: Albert Rossi
Target: master, 0.7
nfs4: fix open CLAIM_PREVIOUS

Open with CLAIM_PREVIOUS used by clients to recover
from server reboots while file is open. As we do not
support persistent storage for stateids, CLAIM_PREVIOUS
processes as CLAIM_FH (open by file handle).

Acket-by: Albert Rossi
Target: master, 0.7