heat: switch auth_uri to use uri_no_suffix
heat: switch auth_uri to use uri_no_suffix

Switch Heat to use auth_uri with keystone versionless endpoint.

Change-Id: Iddd091a659d37d965b216db9f536d30245cd3c3a
Partial-implement: blueprint keystone-v3

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates