Removes a module-level variable that was just a
pointer to the httplib.HTTPConnection class. It's
purpose was to give mock.patch a target that wouldn't
affect other code using the httplib.HTTPConnection
library. However, it is unnecessary now that the
root cause of the original patches not being stopped
by mock.patch.stopall was fixed in bug 1303605 (change
Ia5b374c5f8d3a7905d915de4f1f8d4f3a6f0e58d).
Closes-Bug: #1304558
Change-Id: Idf814b075a80245bb9751466c2b58d719a1b81f3
3a994e1d9f