Enable Unit Test add additional tooling to support running tests
and building virtual environments to mirror what is done in horizon.
Partially implements blueprint mistral-enrich-dashboard
Change-Id: I15b2b28a3a30e8c2ead3b2f68bf2986becbe7914
Also:
- add license headers
- set up tox for flake8 checks and venv
- remove run_tests.sh, tools/ and other stuff we don't need at the moment
- add basic sphinx setup for later use
Change-Id: I0d34fb9fd0bfd351d20474da88715b30ff3c3d61