Merge with backout

Backed out changeset cb1f9266130b: better way to achieve this to be committed Real Soon Now.

mod_tls: Refactor to simplify detection of whether we can do TLS on a connection

stanza_router: Fire /self events for stanzas users send to their own bare JID.

mod_tls: Don't offer TLS on hosts that don't have any certs

sessionmanager, s2smanager: Fix for syntax of null_data_handler() (thanks Nolan)

sessionmanager, s2smanager: Give sessions dummy data handlers that log when data is received by a destroyed session

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mercurial