Prepare for the Image API v1 to be removed from glance during Rocky
by splitting the functional tests that hit v1 from the tests that hit
v2. Introduce a new job that runs the functional-v1 tests against a
devstack running glance stable/queens, and configure this job for both
check and gate for the glanceclient. The v2 functional tests
continue to be run for both check and gate against a devstack running
glance master.
Change-Id: Ifa98ada26a84e4cca3ea8c98173f61a6174cca27
