(necessary in order to play nicely with vnode_setup).  rc.vinit now
figures out he nodeid based on the file in which libsetup stores it.

vserver node.  The process starts with rc.vinit, which is called
either by the service manager, the pnode boot, or by a vnode reboot.
rc.vinit calls vnodesetup, which calls rc.inplab, which calls
plabsetup.