Add a new vnode op (cachedlookup) so that filesystems can plug into a global vfs_cache check.  The rest of this change will come when the current zero size file problem is resolved.
Add a new vnode op (cachedlookup) so that filesystems can plug into
a global vfs_cache check.  The rest of this change will come when the
current zero size file problem is resolved.

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