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/core.yml b/keystone/client/core.yml
index 39d28de..f869059 100644
--- a/keystone/client/core.yml
+++ b/keystone/client/core.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    keystone_service_protocol: http
   linux:
     system:
       job:
@@ -16,6 +18,7 @@
             host: ${_param:keystone_service_host}
             port: 35357
             token: ${_param:keystone_service_token}
+            protocol: ${_param:keystone_service_protocol}
           roles:
           - admin
           - Member
@@ -38,3 +41,4 @@
             port: 5000
             region_name: ${_param:openstack_region}
             use_keystoneauth: true
+            protocol: ${_param:keystone_service_protocol}