Fix handling of ".." in nfs_lookup() for the forced dismount case by cribbing the change made to the regular nfs client in r194358.
Fix handling of ".." in nfs_lookup() for the forced dismount case
by cribbing the change made to the regular nfs client in r194358.

Approved by:	kib (mentor)

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase