tox: Use python3 within tempestenv
If3ff71dbe636ef98072b15f6599e6e641c222f30 had switched this to python3.6 but this breaks on distros where 3.6 is no longer provided by default, such as Fedora. Closes-Bug: #1861308 Change-Id: I0e0b9e88eea2499cb1b9727a7787c050c869c819
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