Currently kayobe creates kolla-ansible venv using kayobe venv
python3. There are corner cases when creation k-a venv fails
while using kayobe venv created with python 3.6 buggy setuptools/
virtualenv command. Using OS python to create venv solves those
corner cases issues and preserves compatibilty.
Story: 2010634
Task: 47599
Change-Id: Ie0d9bf895f6714cbb8b0bd31a008eb388f4c51c2