Introduce ids for domain entity type (#287)

Author: suresh-prakash

entity-service/src/integrationTest/resources/configs/entity-service/application.conf

@@ -47,6 +47,10 @@ entity.service.idAttributeMap = [
     scope = BACKEND
     attribute = BACKEND.id
   },
+  {
+    scope = DOMAIN
+    attribute = DOMAIN.id
+  }
 ]
 
 # This should be completely driven based on config given in app packaging.