mod_pubsub_post: Restructure authentication and authorization (BC) This deprecates the default "superuser" actor model and makes the default equivalent to the previous "request.id". A single actor and secret per node is supported because HTTP and WebHooks don't normally include any authorization identity. Allowing authentication bypass when no secret is given should be relatively safe when the actor is unprivileged, as will be unless explicitly configured otherwise.

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summary: Answers disco#info queries on the behalf of the recipient
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Description
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This module intercepts disco#info queries and checks if we already know the
capabilities of this session, in which case we don’t transmit the iq and answer
it ourselves.