This is a combination of three commits from master:
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Isolate docs requirements
...since modern sphinx won't install on py27.
While we're at it, clean up some warnings and treat warnings as errors.
Also, fix up how we parse test configs so we can run func tests.
Related-Change: Id3c2ed87230c5918c18e2c01d086df8157f036b1
(cherry picked from commit 113eacf3b8)
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Drag forward prettytable in lower-constraints
Apparently version 0.7 got unpublished recently.
(cherry picked from commit 5bd66947fc)
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docs: Clean up formatting
(cherry-picked from commit 7563d9cb56)
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Change-Id: I3c6bca460ee5ff99195495a29e8b8bbf4ed804ff
172aa90169