(Really commited by newbold, but I am paperbagged) Added stuff to clean up IPs from the interfaces table. Removes all IPs for each node except the control_net card, as defined in node_types.
(Really commited by newbold, but I am paperbagged) Added stuff to clean up IPs from the interfaces table. Removes all IPs for each node except the control_net card, as defined in node_types.

nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome,nmc-probe/emulab-nome