Babel: Add source-specific routing support
This patch adds support for source-specific routing to the Babel protocol. It changes the protocol to support both NET_IP6 and NET_IP6_SADR channels for IPv6 addresses. If only a NET_IP6 channel is configured, source-specific updates are ignored. Otherwise, non-source-specific routes are simply treated as source-specific routes with SADR prefix 0. Thanks to Toke Hoiland-Jorgensen for the original patch. Minor changes by Ondrej Santiago Zajicek.
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