This should improve performance of CI jobs. Change-Id: I729862b89b4fe65cbb7f852fac06741b636e4939
Continue to reduce the scope of setup_gate.sh. Allows us to more easily select python 2 or 3. Change-Id: If2eeeacbbbdf58afb765b4a39772b5a1af7b952b Partially Implements: blueprint python-3