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

j-griffith/cinder,bswartz/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,manojhirway/ExistingImagesOnNFS,Paul-Ezell/cinder-1,duhzecca/cinder,openstack/cinder,petrutlucian94/cinder,cloudbase/cinder,takeshineshiro/cinder,tlakshman26/cinder-new-branch,julianwang/cinder,CloudServer/cinder,mahak/cinder,cloudbase/cinder,CloudServer/cinder,saeki-masaki/cinder,dims/cinder,dims/cinder,abusse/cinder,scality/cinder,mahak/cinder,nexusriot/cinder,apporc/cinder,saeki-masaki/cinder,leilihh/cinder,sasukeh/cinder,j-griffith/cinder,blueboxgroup/cinder,julianwang/cinder,takeshineshiro/cinder,blueboxgroup/cinder,Datera/cinder,leilihh/cinder,tlakshman26/cinder-https-changes,hguemar/cinder,Datera/cinder,eharney/cinder,potsmaster/cinder,duhzecca/cinder,Hybrid-Cloud/cinder,Akrog/cinder,bswartz/cinder,winndows/cinder,winndows/cinder,manojhirway/ExistingImagesOnNFS,Paul-Ezell/cinder-1,rakeshmi/cinder,Nexenta/cinder,abusse/cinder,JioCloud/cinder,tlakshman26/cinder-new-branch,Nexenta/cinder,petrutlucian94/cinder,phenoxim/cinder,Accelerite/cinder,NetApp/cinder,scottdangelo/RemoveVolumeMangerLocks,tlakshman26/cinder-bug-fix-volume-conversion-full,scality/cinder,rakeshmi/cinder,apporc/cinder,nikesh-mahalka/cinder,Accelerite/cinder,hguemar/cinder,sasukeh/cinder,ge0rgi/cinder,potsmaster/cinder,eharney/cinder,openstack/cinder,scottdangelo/RemoveVolumeMangerLocks,nikesh-mahalka/cinder,Hybrid-Cloud/cinder,phenoxim/cinder,NetApp/cinder,nexusriot/cinder,JioCloud/cinder,Akrog/cinder,tlakshman26/cinder-https-changes