WIP fix tests

Adapt stream manangement tests to work with simon's newest escalus

Add tests for XEP-0079 Advanced Message Processing
Change sm predicate names to reflect escalus 2.5.0 naming scheme
Support other session backends in stream management tests
xep-0079-amp
Disable auto_ack in resumption tests
Merge pull request #69 from esl/xep-0079-amp

Xep 0079 amp