Requests/urllib3 started issuing warnings about certificates and SSL
that our users are unable to do anything about. This is a very blunt
way to suppress these warnings unless --verbose or --debug is
supplied on the command line.
Being more precise in the suppression requires importing the warning
classes from urllib3 and dealing with the platforms where it has
been unvendored from requests. Maybe in the future if there are
concerns that this mutes too much otherwise.
Change-Id: I50bb10a16222de12c5b95bfe042b92e43ea8ee7c
ec4ef5f5ba