Always disable the DHCP dynamic range in an elabinelab.
Always disable the DHCP dynamic range in an elabinelab.

We were doing this just in the CONFIG_SINGLENET case, but we have to
do this even when the experiment has a private cnet since the inner
dhcpd has to respond to PXE boots on the real control net.

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