We reinitialize the venv to ensure that the right version of
python is in the venv, but we do not want virtualenv to also
replace pip, setuptools and wheel so we tell it not to. If we
don't do this then virtualenv will install the latest available
version, which is not what we want.
Change-Id: Id29497b36cd2b9cca3f3b08474e1001d528931b6
Partial-Bug: #1764470