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

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