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build: use python3 to build and test on Travis
Request Python 3 with pyenv and ensure that python3 is used by Makefile to run Python scripts. PR-URL: #29451 Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Sam Roberts <vieuxtech@gmail.com> Reviewed-By: Rod Vagg <rod@vagg.org>