added-yang-linter-and-resolved-all-error-produced-by it

Change-Id: Iba95a07bb1ed6230b9a900448bf294355a58285c
diff --git a/config-models/aether-2.1.x/files/yang/connectivity-service.yang b/config-models/aether-2.1.x/files/yang/connectivity-service.yang
index f12340b..139a93f 100755
--- a/config-models/aether-2.1.x/files/yang/connectivity-service.yang
+++ b/config-models/aether-2.1.x/files/yang/connectivity-service.yang
@@ -23,6 +23,7 @@
         type string {
             length 1..32;
         }
+    description "The typedef for connectivity-service-id";
   }
 
   container connectivity-service {
@@ -43,7 +44,7 @@
             length 1..80;
         }
         description "display name to use in GUI or CLI";
-      }     
+      }
 
       leaf description {
         type string {
@@ -65,7 +66,7 @@
       leaf pcrf-endpoint {
         type inet:uri;
         description "url of the pcrf service";
-      }         
+      }
     }
-  } 
+  }
 }