Support 2-way SSL with Keystone server if it is configured to enforce 2-way SSL.  See also https://review.openstack.org/#/c/7706/ for the corresponding review for the 2-way SSL addition to Keystone.
Support 2-way SSL with Keystone server if it is configured to enforce
2-way SSL.  See also https://review.openstack.org/#/c/7706/ for the
corresponding review for the 2-way SSL addition to Keystone.

Change-Id: If0cb46a43d663687396d93604a7139d85a4e7114

jamielennox/keystoneauth,citrix-openstack-build/keystoneauth,sileht/keystoneauth