Test that a client cannot authenticate without TLS when it is required

The test reveals a bug that were allowing a client to authenticate
without TLS after requesting compressed connection - although TLS was
required by the server.

Should be merged along with esl/escalus#47.
This assert should be done using `escalus:assert/2` or `escalus:assert/3` function and appropriate predicate from escalus_pred. If there is no suitable predicated you can define new one or use local fun.