remove deprecated start() method

Change-Id: I91de662a165b943f46cff8b023e637633f9133c0
diff --git a/protocols/openflow/ctl/src/main/java/org/onosproject/openflow/controller/impl/Controller.java b/protocols/openflow/ctl/src/main/java/org/onosproject/openflow/controller/impl/Controller.java
index b25c7fc..cb6df8d4 100644
--- a/protocols/openflow/ctl/src/main/java/org/onosproject/openflow/controller/impl/Controller.java
+++ b/protocols/openflow/ctl/src/main/java/org/onosproject/openflow/controller/impl/Controller.java
@@ -583,11 +583,6 @@
         return ofSwitchDriver;
     }
 
-    @Deprecated
-    public void start(OpenFlowAgent ag, DriverService driverService) {
-        start(ag, driverService, null);
-    }
-
     public void start(OpenFlowAgent ag, DriverService driverService,
                       NetworkConfigRegistry netCfgService) {
         log.info("Starting OpenFlow IO");