Add virtualenv line in bootstrap
Add virtualenv line in bootstrap

Adds venv setup line into the bootstrap IR2 doc file
RHOSINFRA-622

Change-Id: I4ca3827edc8214d73c8aa890ec3edfc47f8b3fbf

okolisny/InfraRed,redhat-openstack/infrared,redhat-openstack/infrared,okolisny/InfraRed,okolisny/InfraRed,redhat-openstack/infrared