Comment 4 for bug 1542164

I was trying to backport the pip_install lines to add the "-c $REQUIREMENTS_DIR/upper-contstraints.txt" to the pip command in inc/python, but this does not seem to work, in fact the version in global-requirements.txt and upper-constraints.txt do not match.

For example pbr in global requirements has <1.0, while in upper constraints has 1.2.0