Code review comment for ~kzapalowicz/snappy-hwe-snaps/+git/jenkins-jobs:feature/use-http-proxy-for-pip

@kzapalowicz as a suggestion, why don't you test this simply by creating an auxiliar job in one of our jenkins instances and pasting around some code that uses pip? Just to prove this is what we actually need and to avoid more PRs in case this needs corrections.