1. Redirect to outer emulab XMLRPC server when invoked from an inner
   emulab (as it is from the newnode web page). The XMLRPC server
   constructs the response using the interfaces and wires table
   entries for the nodes in the inner emulab.

2. Changes hardwired "experimental" and "control" strings to libdb
   defs (which are actually different strings, but since no one
   actually looks at that part of the switchmac return, the change is
   not going to bother anyone.