Allow setting protocol for internal endpoints

This patch unhardcode protocol on internal endpoints in
keystone.client classes. It may be changed by setting
{service_name}_internal_protocol param on cluster level.

Change-Id: I37f75003f1a30aa8fb944a84f1a7fa603ca1f725
Related-Prod: PROD-17043
diff --git a/keystone/client/service/heat.yml b/keystone/client/service/heat.yml
index d7eadd5..c8882dd 100644
--- a/keystone/client/service/heat.yml
+++ b/keystone/client/service/heat.yml
@@ -1,6 +1,7 @@
 parameters:
   _param:
     cluster_public_protocol: https
+    heat_service_protocol: http
   keystone:
     client:
       server:
@@ -28,6 +29,8 @@
                 internal_address: ${_param:heat_service_host}
                 internal_port: 8004
                 internal_path: '/v1/%(project_id)s'
+                internal_protocol: ${_param:heat_service_protocol}
+                admin_protocol: ${_param:heat_service_protocol}
                 admin_address: ${_param:heat_service_host}
                 admin_port: 8004
                 admin_path: '/v1/%(project_id)s'