NFSv4.1: Even if the stateid is OK, we may need to recover the open modes

TEST_STATEID only tells you that you have a valid open stateid. It doesn't
tell the client anything about whether or not it holds the required share
locks.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Tested-by: Oleg Drokin <green@linuxhacker.ru>
[Anna: Wrap nfs_open_stateid_recover_openmode in CONFIG_NFS_V4_1 checks]
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>