tox: Build docs with Python 2.7
The 'list-modules' directive used in some docs does not appear to be Python 3 compatible, yielding the following error: TypeError: unorderable types: NoneType() < str() Simply use Python 2.7 until such a time as someone wants to investigate why this happens. Change-Id: I0be19b056e1c2272df3666626fbd17ec78017bce
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