
Fixed issues failing to install tox on python3 only systems which have only pip3 executable and not the pip one. Needed-By: https://review.rdoproject.org/r/#/c/24584/ Change-Id: Ie50928c9b782ea84db916bb1441567e1206ff466
Ensure tox is installed
If tox is not already installed, it will be installed via pip in the user install directory (i.e., "pip install --user").