subnodes is dealing with the hosting node, and the "fakelink" that
we have to insert until assign is taught how to deal with hosting
nodes. The fakelink causes assign to grab both nodes together.

Also: * Minor cleanup.
      * Change control_net to control_iface.
      * Set the routertype to "manual" for jail hosts, and "none" for
        delay nodes. This is done in InitPnode.
      * Get rid of more shark code.