Glance: Change seed json to use config hierarchy
Glance: Change seed json to use config hierarchy

Change the Glance section of the seed json to use
the new hierarchical Glance param style (glance.api.param/
glance.registry.param).

Change-Id: I28073cef5c9b4cd6087c4f375a2394d612fe8dd7

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