Updated openstack/openstack
Project: openstack/nova  9cef4842937c37d338506066c6a79135388a2e2e
null
Minor changes to make certificates test cases use HTTPRequestV3

The existing certificates test in v3 API version test correctly
but it use HTTPRequest keyword inside its test cases and has v2
keyword. Though it will not affect the test, change to HTTPRequestV3
will be helpful in the future.

Change-Id: I0992152e56a3f5b5972e48cb6cda16ef39cacdd2