Add IPV6 changes, contributed by Brecht and lightly modified by me.
To define, in the defs file: IPV6_ENABLED=1 IPV6_SUBNET_PREFIX="2011:1948:0417:0004" A /64 network is always assumed, don't do anything else. We generate appropriate foward and reverse entries in the zone files, but otherwise rely on the on the upstream router to provide the prefix when asked for it by nodes when they wish to configure an IPV6 interface. Important caveats: 1. The infrastructure is ipv4 only. We do not dupport dual stack or ipv6 only on any infrastructure. 2. We do not support ipv6 only on the control plane; ipv4 or dual stack.
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