Remove "public" to follow our convention

Change-Id: Ic5fa8744cbcb4c704780c8467ae0f31fce3327ce
diff --git a/core/api/src/main/java/org/onosproject/net/group/Group.java b/core/api/src/main/java/org/onosproject/net/group/Group.java
index b7872de..776d24f 100644
--- a/core/api/src/main/java/org/onosproject/net/group/Group.java
+++ b/core/api/src/main/java/org/onosproject/net/group/Group.java
@@ -24,7 +24,7 @@
     /**
      * State of the group object in ONOS.
      */
-    public enum GroupState {
+    enum GroupState {
         /**
          * Group create request is queued as group AUDIT is in progress.
          */