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This provides a way to run functional tests from the gate, initially just a simple set of gabbi tests which exercise the API. Once this has proven to be working we can add more. The model here is a hybrid of what was started for ceilometer and what was used in gnocchi with some adjustments to allow for some local testing. The tests produced by test_gabbi_live will only run if AODH_SERVICE_URL is set to the alarming endpoint. A keystone auth token is needed in AODH_SERVICE_TOKEN. post_test_hook.sh makes this happen if we are in a devstack-gate environment. Otherwise they must be set by the caller. The expectation is that we'll stick more test in tests/functional as we have time, energy and brains. Note that the layout of the functional tests assumes that the tests will skip (or not even generate tests) if a functional environment is not in place, such as when the unit tests are run. Change-Id: Ia40e9c6b956209ecd0086ca861a90ce0c92b7b10