Pytest-rabbitmq

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- [enhancements] adjust pytest-rabbitmq to pytest 3. require pytest 3.

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- [enhancements] command line and pytest.ini options for modifying rabbitmq node name
- [enhancements] command line and pytest.ini options for modifying server exec path
- [enhancements] command line and pytest.ini options for modifying ctl exec path
- [enhancements] command line and pytest.ini options for modifying host
- [enhancements] command line and pytest.ini options for modifying port
- [enhancements] command line and pytest.ini options for modifying logs directory destination