Centralize setting internal_protocol

Internal Openstack APIs may be encrypted with https. This patch
centralize setting internal API protocol among services by
setting one of depending if cluster or single models are used:
  cluster_internal_protocol: 'https'
  internal_protocol: 'https'

Change-Id: I2baff79cd5851678559d7de47460fdd2031f70ee
diff --git a/nova/control/single.yml b/nova/control/single.yml
index c2aef10..ca21d05 100644
--- a/nova/control/single.yml
+++ b/nova/control/single.yml
@@ -1,6 +1,8 @@
 classes:
 - service.nova.control.single
 parameters:
+  _param:
+    cluster_internal_protocol: 'http'
   linux:
     system:
       package:
@@ -11,3 +13,9 @@
     controller:
       database:
         host: ${_param:single_address}
+      identity:
+        protocol: ${_param:cluster_internal_protocol}
+      network:
+        protocol: ${_param:cluster_internal_protocol}
+      glance:
+        protocol: ${_param:cluster_internal_protocol}