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: I5f7e8fd36185537543d0741d88a5ccc9cd1f1645
Partial-Bug: #1764470
(cherry picked from commit a686b93020)