Deal with PEP-0476 certificate chaining checking
Deal with PEP-0476 certificate chaining checking

PEP-0476 introduced more thorough certificate chain verfication
for HTTPS connectivity; this was introduced in Python 2.7.9, and
breaks a number of unit tests in the cinder codebase.

Disable certificate chain verification for cinder SSL tests
using the backwards compatible SSLContext provided for this
purpose.

Change-Id: Iffc3658196f608c7a7c9b6527dc8e7210fb05bff
Closes-Bug: #1403068
(cherry picked from commit 4e849ef5fbb7159276435ac6f7315bf20274768d)

redhat-openstack/cinder,alex8866/cinder,alex8866/cinder,redhat-openstack/cinder