* Change URL for isc-dhcp source repository
* Modify supervisor conf to generate dhcrelay commands with '-id' and '-iu' options
* Comments; Also clean up jinja2 syntax
* Patch relay to open one socket per interface and send to all servers on all upstream interfaces
* Patch relay agent to properly forward BOOTREQUEST only on appropriate interface if it is a directed broadcast
* Port upstream patches to isc-dhcp-relay to support upstream/downstream interfaces
* Update patch to properly support interfaces with multiple IP addresses assigned
* Pass --enable-use-sockets to configure instead of uncommenting USE_SOCKETS directly
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