Fix Sonar errors: public data members in classes

Change-Id: I7aca37d5553436167ac6e7b2206392f88bddc118
diff --git a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/IPReachabilityInformationTlv.java b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/IPReachabilityInformationTlv.java
index 9cdccc5..ce1c443 100644
--- a/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/IPReachabilityInformationTlv.java
+++ b/protocols/bgp/bgpio/src/main/java/org/onosproject/bgpio/types/IPReachabilityInformationTlv.java
@@ -49,7 +49,7 @@
 
     private byte prefixLen;
     private byte[] ipPrefix;
-    public short length;
+    private short length;
 
     /**
      * Constructor to initialize parameters.
@@ -162,4 +162,4 @@
                 .add("Prefixvalue", getPrefixValue())
                 .toString();
     }
-}
\ No newline at end of file
+}