[ONOS-3856] BGP flow specification update message encode.

Change-Id: I4286ea636df154f64c5b27f1f55a26fdc257e4f3
diff --git a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/flowspec/BgpFlowSpecDetails.java b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/flowspec/BgpFlowSpecDetails.java
index 2f2eb6f..cc6384c 100755
--- a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/flowspec/BgpFlowSpecDetails.java
+++ b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/protocol/flowspec/BgpFlowSpecDetails.java
@@ -27,8 +27,8 @@
  */
 public class BgpFlowSpecDetails {
     private List<BgpValueType> flowSpecComponents;
-    BgpValueType fsActionTlv;
-    RouteDistinguisher routeDistinguisher;
+    private BgpValueType fsActionTlv;
+    private RouteDistinguisher routeDistinguisher;
 
     /**
      * Flow specification details object constructor with the parameter.