Change virtualenv/init.py to Python 2
Change virtualenv/init.py to Python 2

Change env_setup/virtualenv/init.py to Python 2. This will allow
the entire environment to be set up using one Python 2 script which
can then be run via PyOxidizer.

Change-Id: Ied3d64f34476ab0b7e9f4a06f646bd7eaa4bf84c

google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed,google/pigweed