the repo is building using Python 3, so remove some cruft:
* Remove python 2 requirements
* Remove python2 stanza from setup.py
* Remove obsolete sections from setup.cfg
* Remove unused variables from tox.ini
Change-Id: Ia56048d901f2fa0099341f349b02c7ac76a40b82
Move the draft of the restructured HA guide to this dedicated
repository, in order to focus reviews on a smaller, more specialist
audience and accelerate development.
Change-Id: I95a4b46fecaafafd1beb8314d1cf795b60fb17a8