* Upgrade pydocstyle to 4.0.0 and flake8-docstrings to 1.3.1
http://www.pydocstyle.org/en/4.0.0/release_notes.html#july-6th-2019
* Address pydocstyle D413's
* tox: do not run pydocstyle
Does not seem to add any value over flake8-docstrings (and would have
needed a D202 exclusion).
* Revert "Add some debugging to azure mypy job (#25632)"
This reverts commit 767b8e9f25.
No longer needed.
* Install setup.py dependencies for mypy in Azure
For better coverage, and to match what tox does.