Prep work for DHCP discovery of control net interface:
- have pump/dhclient script record the DHCP'ed interface in /var/emulab/boot/control_interface - change control_interface script to first check for that file and use the contents if it exists Note that, as of this commit, we are still telling pump/dhclient which interface to DHCP on (i.e., we still determine the control net interface the old way to invoke pump/dhclient) so this commit is not that useful. What still has to be done is to change the startup to invoke dhclient/pump on all interfaces. This turns out to be a royal, royal PITA. Stay tuned...
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