These changes make oslo.tools more user friendly by documenting tools
introducing commands shortcut etc...
Introduced changes:
- add doc and build it with tox
- add tox and shortcut commands
- centralize tools
- launch zuul jobs
- apply pep8
- apply bashate
Change-Id: I0f948c9f507b8c951c5748265699a2f515350ff9
The commands to get the latest version used to use a head call to pull
out the latest. They don't do that any more, so the semver filter should
be working properly to determine the latest tag.
Change-Id: I34be2e0e18614a611251a216d1d95029173fb60c