NFSv4: Clean up nfs4_select_rw_stateid()

Ensure that we select delegation stateids first, then
lock stateids and then open stateids.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --cc fs/nfs/nfs4_fs.h
Simple merge

diff --cc fs/nfs/nfs4proc.c
Simple merge

diff --cc fs/nfs/nfs4state.c
Simple merge

diff --cc fs/nfs/nfs4xdr.c
Simple merge