* Fix docs for python 3
* Make travis behave like it's inside our container, fix tox/makefile accordingly
* Fix docs build by choosing another label than _search (which is already used)
* Fix codestyle linter issues
* Remove extra force_bytes import
* Add ignore for int|null in docs as it's used in a couple places and it's valid
* Fix more docs build failures in reviewers.rst
Also build docs with -W by default to make future docs breakage
easier to spot locally.
* Leave -f Makefile-docker for UI Tests as they are not running from the standard container
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