Remove "public" to follow our convention

Change-Id: Ic5fa8744cbcb4c704780c8467ae0f31fce3327ce
diff --git a/apps/virtualbng/src/main/java/org/onosproject/virtualbng/VbngService.java b/apps/virtualbng/src/main/java/org/onosproject/virtualbng/VbngService.java
index 26e6e10..4ac7606 100644
--- a/apps/virtualbng/src/main/java/org/onosproject/virtualbng/VbngService.java
+++ b/apps/virtualbng/src/main/java/org/onosproject/virtualbng/VbngService.java
@@ -34,6 +34,6 @@
      * @return the public address if a virtual BGN is successfully created,
      *         otherwise return null
      */
-    public IpAddress createVbng(IpAddress privateIpAddress);
+    IpAddress createVbng(IpAddress privateIpAddress);
 
 }