Registry module is disabled by default so we can still run ONOS without it trying to connect to zookeeper.

Added a config option to enable it. The option is (currently)
net.floodlightcontroller.mastership.MastershipManager.enableZookeeper = true
diff --git a/src/main/java/net/floodlightcontroller/mastership/RegistryException.java b/src/main/java/net/floodlightcontroller/mastership/RegistryException.java
index 134117c..fcc14a6 100644
--- a/src/main/java/net/floodlightcontroller/mastership/RegistryException.java
+++ b/src/main/java/net/floodlightcontroller/mastership/RegistryException.java
@@ -3,12 +3,13 @@
 public class RegistryException extends Exception {
 
 	private static final long serialVersionUID = -8276300722010217913L;
-
+	
 	/*
 	public RegistryException() {
 		// TODO Auto-generated constructor stub
 	}
 
+	
 	public RegistryException(String message) {
 		super(message);
 		// TODO Auto-generated constructor stub
@@ -18,17 +19,10 @@
 		super(cause);
 		// TODO Auto-generated constructor stub
 	}
-
+	*/
+	
 	public RegistryException(String message, Throwable cause) {
 		super(message, cause);
-		// TODO Auto-generated constructor stub
 	}
 
-	public RegistryException(String message, Throwable cause,
-			boolean enableSuppression, boolean writableStackTrace) {
-		super(message, cause, enableSuppression, writableStackTrace);
-		// TODO Auto-generated constructor stub
-	}
-	*/
-
 }