Upgrade pip and setuptools in the mirror venv

Older pip does not process transitive dependencies properly. To ensure
that 3rd level transitive depends get processed by run-mirror, ensure
that we have current pip in our mirror build environment.

Without upgrading setuptools, we can hit the transitive depend problem.

Change-Id: I4a4611109ed9b35dea2efc00583ab69ebc1a39ba
1 file changed