Called after performing channel discovery using RFC7033 webfinger and where the channel is not recognised as zot.
Passed an array:
address: URL or address that is being discovered
success: set to true if the plugin discovers something
webfinger: array of webfinger links (output of webfinger_rfc7033())
if your plugin indicates success you are expected to generate and populate an xchan (and hubloc) record prior to returning.