Changes monitoring-param-ref from leafref as there could be monitoring parameters on two locations

Change-Id: Ie263665428334edee8571b18d023adf12f6ed7cf
Signed-off-by: garciaale <agarcia@whitestack.com>
diff --git a/models/augments/scaling.yang b/models/augments/scaling.yang
index 049ebc7..647edf1 100644
--- a/models/augments/scaling.yang
+++ b/models/augments/scaling.yang
@@ -135,9 +135,8 @@
                     description
                       "Reference to the VNF level monitoring parameter
                        that is aggregated";
-                    type leafref {
-                        path "/vnfd:vnfd/vnfd:df/vnfd:monitoring-parameter/vnfd:id";
-                    }
+                    type string;
+                    
                 }
             }
         }
@@ -166,4 +165,4 @@
     augment "/vnfd:vnfd/vnfd:df/vnfd:scaling-aspect" {
         uses extended-scaling;
     }
-}
\ No newline at end of file
+}