[ONOS-5542]Configuration order of values for leaf-list is not proper

Change-Id: I1487f92bc5019adafb0a06b9b22f2db004a10435
diff --git a/protocols/restconf/server/utils/src/main/java/org/onosproject/protocol/restconf/server/utils/parser/json/JsonToYdtListener.java b/protocols/restconf/server/utils/src/main/java/org/onosproject/protocol/restconf/server/utils/parser/json/JsonToYdtListener.java
index 1118116..546bed7 100755
--- a/protocols/restconf/server/utils/src/main/java/org/onosproject/protocol/restconf/server/utils/parser/json/JsonToYdtListener.java
+++ b/protocols/restconf/server/utils/src/main/java/org/onosproject/protocol/restconf/server/utils/parser/json/JsonToYdtListener.java
@@ -26,8 +26,8 @@
 import org.onosproject.yms.ydt.YdtContext;
 import org.slf4j.Logger;
 
-import java.util.HashSet;
 import java.util.Iterator;
+import java.util.LinkedHashSet;
 import java.util.Set;
 import java.util.Stack;
 
@@ -149,7 +149,7 @@
         if (arrayNode.size() == 0) {
             return;
         }
-        Set<String> sets = new HashSet<>();
+        Set<String> sets = new LinkedHashSet<>();
         Iterator<JsonNode> elements = arrayNode.elements();
         boolean isLeafList = true;
         while (elements.hasNext()) {