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

Change-Id: Iba95a07bb1ed6230b9a900448bf294355a58285c
diff --git a/config-models/aether-3.x/files/yang/device-group.yang b/config-models/aether-3.x/files/yang/device-group.yang
index e9c1590..feb0337 100755
--- a/config-models/aether-3.x/files/yang/device-group.yang
+++ b/config-models/aether-3.x/files/yang/device-group.yang
@@ -13,7 +13,7 @@
 
   organization "Open Networking Foundation.";
   contact "Scott Baker";
-  description 
+  description
     "An aether device group represents a list of device IMSIS.
      This list is expressed as a set of ranges,
          [(from_imsi, to_imsi),
@@ -33,7 +33,8 @@
         type yg:yang-identifier {
             length 1..32;
         }
-  }  
+    description "The typedef for device-group-id";
+  }
 
   container device-group {
     description "The top level container";
@@ -58,19 +59,22 @@
             length 1..80;
         }
         description "display name to use in GUI or CLI";
-      }      
-      
+      }
+
       list imsis {
         // TODO: imsi-range-from cannot be used as a list index
         key "name";
         leaf name {
           type string;
+          description "The leaf for imsi name";
         }
         leaf imsi-range-from {
           type uint64;
+	  description "The leaf for imsi-range-from";
         }
         leaf imsi-range-to {
           type uint64;
+          description "The leaf for imsi-range-to";
         }
         description
           "List of imsi ranges that comprise this group. It's acceptable for
@@ -80,7 +84,7 @@
       leaf ip-domain {
         type leafref {
           path "/ipd:ip-domain/ipd:ip-domain/ipd:id";
-        }          
+        }
         description
           "Link to ip-domain settings that determine the pool of IP addresses,
            as well as the domain resolver settings to use";
@@ -95,5 +99,5 @@
           "Link to site";
       }
     }
-  } 
+  }
 }