Parameterize ci-overcloud endpoint for deploy-testenv.
Parameterize ci-overcloud endpoint for deploy-testenv.

Change-Id: Ic92fd1f9603cff0127c3eaca17359aedab41e1ed

rdo-management/tripleo-image-elements,radez/tripleo-image-elements,openstack/tripleo-image-elements,radez/tripleo-image-elements,rdo-management/tripleo-image-elements,openstack/tripleo-image-elements