Add logging fixture to integration tests

Change-Id: I55bffc4278fc92d4f8eff012acd75c1acb1eddeb
Add support for running tests against standalone Heat

This replicates what is in heatclient shell.
We need support for the OS_NO_CLIENT_AUTH.

Change-Id: I40990555f072d3e10db704c0f63f19db9c8ed8bf
Merge "Add logging fixture to integration tests"
Merge "Add support for running tests against standalone Heat"