Smack should not reply with multiple stream types after stream initiation is offered

Instead of replying as described in Example 4 of XEP-95, Smack replies with multiple stream types

This is caused by StreamNegotiator, but the real problem is that Smack treats the data form like list-multi, when it is specified a list-single. I can only guess why this is the cause, but it may be related to FaultTolerantNegoiator, which seams like a non-standard way to implement fallback from S5B to IBB.

Reported at http://stackoverflow.com/a/23519620/194894