Enable shared lookups on UFS.  There are some remaining issues with forced unmounts, but those are in the VFS lookup code are not UFS specific.
Enable shared lookups on UFS.  There are some remaining issues with forced
unmounts, but those are in the VFS lookup code are not UFS specific.

Tested by:	pho, kris

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