Fix disconnection issue when parsing SASL success that contains a payload
Smack is sometimes failing and disconnecting when parsing a SUCCESS stanza like this: <success xmlns="urn:ietf:params:xml:ns:xmpp-sasl">cnNwYXV0aD0wODE4YTE1ZWVlYjJiYTdmNmE1YWM3NWQ1ODIxZjVhZg==</success>.
The weird thing is that it does not happen all the time. Thanks Jeff for your fix!!!