In bindep files we use a 'test' environment to indicate dependencies
that are needed for testing. Make the same thing available for our
python dependencies, allowing things like "pip install .[test]" or "pip
install shade[test]" to work.
Change-Id: If3ad8b6a79a8cab2f7434b73207f35384e8516ba
Setuptools doesn't [yet] support markeres in tests_require parameters
to setup(). While we need to get that fixed, we also need to support
syncing marker constrained requirements from global-requirements.
Since version constraints are needed to successfully port to Python3
this won't be a long term viable solution: but few of our test-only
dependencies require version constraints, so we can do this in the
interim. The ones that do - such as python-mysql - we're either
moving away from, or centralising them into optional dependencies
on other packages where the tests_require limitation shouldn't apply.
Change-Id: I31adaf35c8d7b72fe3f8c9242cc356fe34d537e8
Monty Taylor