[ONOS-6147] POST operation support utility list node processing

Change-Id: I4b2930321440e859ff20c4844694e2bebddd45a3
diff --git a/apps/restconf/restconfmgr/src/main/java/org/onosproject/restconf/restconfmanager/RestconfManager.java b/apps/restconf/restconfmgr/src/main/java/org/onosproject/restconf/restconfmanager/RestconfManager.java
index 349c0f1..9054993 100644
--- a/apps/restconf/restconfmgr/src/main/java/org/onosproject/restconf/restconfmanager/RestconfManager.java
+++ b/apps/restconf/restconfmgr/src/main/java/org/onosproject/restconf/restconfmanager/RestconfManager.java
@@ -232,6 +232,8 @@
                     dbr = dbr.createChildBuilder(keyLeaf.leafSchema().name(),
                                                  sid.namespace(), val)
                             .type(SINGLE_INSTANCE_LEAF_VALUE_NODE);
+                    //Exit for key leaf node
+                    dbr = dbr.exitNode();
                 }
             } else {
                 dbr = InnerNode.builder(