The issue is happening because of the devstack is using secure
connection for all the API calls with the self signed certificate.
This certificate is not trusted by the host so all the openstack
client tests are failed. Need to specify the certificate file with
the `--os-cacert` command line parameter to trust the certificate.
Change-Id: I3f2606d1da5fbcf1bf6ec1472748ddeb6906dd79
53ca561ad8