Python, testing

[Hal Murray]

Matthew.Selsky at twosigma.com said:
> I'm not certain how these scripts are much different than our existing CI
> jobs... we already have CI jobs for both Python2 and Python3. 

You can run them locally rather than waiting for the CI jobs to find problems.

tests/option-tester.sh tries to test all the options to waf and some of the 
interesting combinations.

tests/python{2,3}-tester.sh is an easy way to run a minimal test of the other 
python.


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