Merge

Adding test for xmppstream

All correcthg diff util/xmppstream.lua

Tree structure now similar to prosody stanza format

util.xmllex: Add

util.xmppstream: Prepare for using xmllex

mod_pubsub: Correctly wrap the list of subscriptions in a pubsub element

util.xmppstream: Optimized stanza building by bypassing the stanza API.

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