util.stanza: Ignore false xmlns

util.stanza: Fixes for xmllex-generated stanza objects

stanza_router: Replace xmlns == nil checks with 'not xmlns'

mod_saslauth: Use get_text() instead of directly accessing stanza child text nodes

mod_presence: Use get_text() instead of table.concat

util.xmppstream, util.xmllex: Basic test passes

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.

util.sasl: Cache the calculated mechanisms set for SASL profiles (profile.mechanisms table).

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