Fix obscure elabinelab newnode problem where MAC address was being typed as a double by the RPC::XML library.
Fix obscure elabinelab newnode problem where MAC address was being typed
as a double by the RPC::XML library.

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