nullfs stabilization I

[Matthew Dillon]

    These are all great ideas flying about.  Namecache coherency in the
    sense of the cluster work is not going to happen for a long time, I'm
    just trying to cut down the work that will be involved to make it work
    with nullfs later on down the road.

					-Matt
					Matthew Dillon 
					<dillon at xxxxxxxxxxxxx>