FIXUP Don't allow OPEN of a PseudoFS file

Use NFS4ERR_PERM instead

Signed-off-by: Frank S. Filz <ffilz@us.ibm.com>
Return more sensible errors to client for PseudoFs operations.

Also log a bit more information.

Signed-off-by: Frank S. Filz <ffilz@us.ibm.com>