mod_bookmarks2: Add new module. This is the result of hacking during the Stockholm XMPP Sprint, for compatibility with older clients only doing Private XML XEP-0048. This module shouldn’t be loaded at the same time as mod_bookmarks, as both implement Private XML to achieve their conversion.

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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.