Updated openstack/openstack
Project: openstack/python-heatclient  a2ff9eaeed983ff3bacf60ce32c6bc1e95cff5b5
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Port to python requests

Since python requests has builtins SSL verification we can get ride of
our own implementation.

Increase tests coverage of heatclient.common.http along the way.

Partial Implements: blueprint python-requests-port
Change-Id: I04a169da2334acc91e538ca02cba79d9765752b5