nfs4: implement missing RECLAIM_COMPLETE

make client recovery possible.

Acked-by: Albert Rossi
Target: master, 0.7
(cherry picked from commit 1454aa518c124c16ab6527e88c6ea4ca75859215)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>
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
(cherry picked from commit 4710b27607fc174b4585d36a37b954dda826ad3a)
Signed-off-by: Tigran Mkrtchyan <tigran.mkrtchyan@desy.de>