addPort fails occassionally...do better exception handling
diff --git a/src/main/java/net/floodlightcontroller/core/internal/SwitchStorageImpl.java b/src/main/java/net/floodlightcontroller/core/internal/SwitchStorageImpl.java
index 17ab274..f040881 100644
--- a/src/main/java/net/floodlightcontroller/core/internal/SwitchStorageImpl.java
+++ b/src/main/java/net/floodlightcontroller/core/internal/SwitchStorageImpl.java
@@ -178,7 +178,7 @@
             		log.info("SwitchStorage:deletePort dpid:{} port:{} found and deleted", dpid, port);
             		sw.removePort(p);
             		conn.utils().removePort(conn, p);
-            		conn.endTx(Transaction.COMMIT,GenerateEvent.TRUE);
+            		conn.endTx(Transaction.COMMIT);
             	}
             }
 		} catch (Exception e) {