Use variables for auth_uri and auth_url protocols

Change-Id: Icf5de0684b10c32cc6e29b62d183705d423b4333
Closes-Bug: #1555989

ansible/roles/heat/templates/heat.conf.j2

@@ -48,8 +48,8 @@ username = {{ heat_keystone_user }}
 password = {{ heat_keystone_password }}
 
 [trustee]
-auth_uri = http://{{ kolla_internal_fqdn }}:{{ keystone_public_port }}
-auth_url = http://{{ kolla_internal_fqdn }}:{{ keystone_admin_port }}
+auth_uri = {{ internal_protocol }}://{{ kolla_internal_fqdn }}:{{ keystone_public_port }}
+auth_url = {{ admin_protocol }}://{{ kolla_internal_fqdn }}:{{ keystone_admin_port }}
 auth_plugin = password
 project_domain_id = default
 user_domain_id = default