checkstyle rule to check copyrights

Change-Id: Ia9bab40b5fe64fca539058a4316371f7acc0f387
diff --git a/drivers/optical/src/main/java/org/onosproject/drivers/optical/OpticalDriversLoader.java b/drivers/optical/src/main/java/org/onosproject/drivers/optical/OpticalDriversLoader.java
index 4b84302..89872e4 100644
--- a/drivers/optical/src/main/java/org/onosproject/drivers/optical/OpticalDriversLoader.java
+++ b/drivers/optical/src/main/java/org/onosproject/drivers/optical/OpticalDriversLoader.java
@@ -1,4 +1,3 @@
-package org.onosproject.drivers.optical;
 /*
  * Copyright 2016-present Open Networking Laboratory
  *
@@ -15,7 +14,7 @@
  * limitations under the License.
  */
 
-
+package org.onosproject.drivers.optical;
 
 import org.apache.felix.scr.annotations.Component;
 import org.onosproject.net.driver.AbstractDriverLoader;