Handle httplib implementations that don't set _tunnel_host #1527
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urllib3 removed support for Python versions before 2.7 in a previous
pull request, unfortunately, this broke environments that use a
different implementation of httplib than the one in Python's standard
library as well. This includes Google App Engine's urlfetch-based
implementation
(https://github.com/GoogleCloudPlatform/python-compat-runtime/blob/master/appengine-compat/exported_appengine_sdk/google/appengine/dist27/gae_override/httplib.py#L362)
This pull request is nearly identical to #1504 which was
closed due to its author not responding to comments.
Fixes #1503