Ian Wienand eee316ce7b Enable Python 2.7 unit tests ...

Add a testenv:py27 environment that overrides basepython to 2.7

Unfortunately implicit namespace packages are a Python3 thing [1] so
we have to scatter a few __init__.py's around for the test loader
under python2 to be able to find the unit test directories.

Update documenation to mention this

Needed-By: https://review.openstack.org/592768

[1] https://www.python.org/dev/peps/pep-0420/

Change-Id: I9a653666e8a083fb7f3fbb92589fe0467a41e6e6

2018-08-17 10:23:20 +10:00

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