Travis: Fix tools testing breakage due to multiple python versions #6200
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Travis doesn't recognize version matrices when inside a matrix include job. Instead, it breaks in a way that isn't reported as an error.
Fix is to just manually run the python versions we want to test.
Note: This will result in failures, as it already has for #6195. Will fix as failures are reported.
Please ignore the commit noise for now, will squash at the end.
introduced in #5848
intended for patch
cc @deepikabhavnani, @cmonr, @theotherjimmy
related travis-ci/travis-ci#9275