Fix s2s once and for all

General fixes for s2s, to make it more robust (I hope), sending data to remote hosts sane (s2ssession.send() works as expected), recycle outgoing dialback connections, etc.

Fix for mod_version over s2s

mod_version is here

Was a bit hasty to remove send_s2s() from stanza_router. We still use it, and there is no problem with it.

sends2s -> s2s_session.send(), s2s_session.send() -> s2s_session.sends2s()

Added support for XEP-0049: Private XML Storage (mod_private)

mod_vcard: Fixed to use new util.stanza.add_child

Combined some lines

Datamanager Fixes and improvements

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