avoid transient changes to MastershipStore from being posted as events

Change-Id: Id033cf50f865e44439138f5b3814ebaedb832b73
diff --git a/apps/optical/src/main/java/org/onlab/onos/optical/cfg/OpticalConfigProvider.java b/apps/optical/src/main/java/org/onlab/onos/optical/cfg/OpticalConfigProvider.java
index 342bd5b..5c9de15 100644
--- a/apps/optical/src/main/java/org/onlab/onos/optical/cfg/OpticalConfigProvider.java
+++ b/apps/optical/src/main/java/org/onlab/onos/optical/cfg/OpticalConfigProvider.java
@@ -372,4 +372,8 @@
         // TODO Auto-generated method stub.
     }
 
+    @Override
+    public boolean isReachable(Device device) {
+        return false;
+    }
 }