Network Graph Refactoring: WIP: Implement the mechanism for storing
locally discovered events in in-memory cache. That cache is used
to cleanup events that are related:
 - Removal of a switch will trigger the removal of the corresponding ports.
 - Removal of a port will trigger the removal of the corresponding
   incoming link and attached devices.

Change-Id: Ibf36cf9299f042bf74a11d863ea9e0666e4e4144
diff --git a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/PortEvent.java b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/PortEvent.java
index 8172f29..f89cdf8 100644
--- a/src/main/java/net/onrc/onos/ofcontroller/networkgraph/PortEvent.java
+++ b/src/main/java/net/onrc/onos/ofcontroller/networkgraph/PortEvent.java
@@ -72,7 +72,7 @@
         }
     }
 
-    private final SwitchPort id;
+    protected final SwitchPort id;
     // TODO Add Hardware Address
     // TODO Add Description