Update docs building:
* Switch to sphinx-build
* Update requirements for Sphinx and openstackdocstheme for
python 3, create doc/requiremetns
* Remove unneeded doc and translation sections from setup.cfg
* Remove install_command, it's unneeded, the default is fine.
* Move constraints to deps, use TOX_CONSTRAINTS instead of obsolete
UPPER_CONSTRAINTS
* Remove now unneeded placeholder file
Change-Id: I649e6fa86c17262698cc8a01d042a87b020239d9
The repo is Python 3 now, so update hacking to version 2.0 which
supports Python 3.
Fix problems found.
Update local hacking checks for new flake8.
Change-Id: I2683bc1a7c962da137de4b77aac450f08d1f6c4a
We want to default to running all tox environments under python 3, so
set the basepython value in each environment.
We do not want to specify a minor version number, because we do not
want to have to update the file every time we upgrade python.
We do not want to set the override once in testenv, because that
breaks the more specific versions used in default environments like
py35 and py36.
Change-Id: I7e49d7e03c3557152cee3892e9d039a8378f573e