Remove intersphinx from the docs build as it triggers network calls that
occasionally fail, and we don't really use intersphinx (links other
sphinx documents out on the internet)
This also removes the requirement for internet access during docs build.
This can cause docs jobs to fail if the project errors out on
warnings.
Change-Id: I71e941e2a639641a662a163c682eb86d51de42fb
Related-Bug: #1368910
Make repo support 'tox -epep8' as we want this to be the first gating
check.
Don't make any actual code changes, just change setup and add files.
Further work is needed to re-organize the code, but that can be in a
separate patch.
