[PATCH] Add 'get_capability channels' command

[Jouni Malinen]

Thanks, applied. Though, I changed this to filter out disabled channels
to avoid confusion. It should also be noted that this list includes
channels that won't be allowed for P2P use cases, so there could be use
for another option for filtering out channels that are disabled for P2P.

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Jouni Malinen                                            PGP id EFC895FA