Fix Sonar errors: public data members in classes

Change-Id: I7aca37d5553436167ac6e7b2206392f88bddc118
diff --git a/protocols/ospf/ctl/src/main/java/org/onosproject/ospf/controller/area/OspfAreaAddressRangeImpl.java b/protocols/ospf/ctl/src/main/java/org/onosproject/ospf/controller/area/OspfAreaAddressRangeImpl.java
index e0636d7..1337203 100644
--- a/protocols/ospf/ctl/src/main/java/org/onosproject/ospf/controller/area/OspfAreaAddressRangeImpl.java
+++ b/protocols/ospf/ctl/src/main/java/org/onosproject/ospf/controller/area/OspfAreaAddressRangeImpl.java
@@ -28,9 +28,9 @@
  */
 public class OspfAreaAddressRangeImpl implements OspfAreaAddressRange {
 
-    public Ip4Address ipAddress;
-    public String mask;
-    public boolean advertise;
+    private Ip4Address ipAddress;
+    private String mask;
+    private boolean advertise;
 
     /**
      * Gets the IP address.
@@ -111,4 +111,4 @@
                 .add("advertise", advertise)
                 .toString();
     }
-}
\ No newline at end of file
+}