checkstyle rule to check copyrights

Change-Id: Ia9bab40b5fe64fca539058a4316371f7acc0f387
diff --git a/core/api/src/main/java/org/onosproject/net/behaviour/PortDiscovery.java b/core/api/src/main/java/org/onosproject/net/behaviour/PortDiscovery.java
index 6e22e7f..7f869f9 100644
--- a/core/api/src/main/java/org/onosproject/net/behaviour/PortDiscovery.java
+++ b/core/api/src/main/java/org/onosproject/net/behaviour/PortDiscovery.java
@@ -1,19 +1,17 @@
 /*
+ * Copyright 2016-present Open Networking Laboratory
  *
- *  * Copyright 2016-present Open Networking Laboratory
- *  *
- *  * Licensed under the Apache License, Version 2.0 (the "License");
- *  * you may not use this file except in compliance with the License.
- *  * You may obtain a copy of the License at
- *  *
- *  *     http://www.apache.org/licenses/LICENSE-2.0
- *  *
- *  * Unless required by applicable law or agreed to in writing, software
- *  * distributed under the License is distributed on an "AS IS" BASIS,
- *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *  * See the License for the specific language governing permissions and
- *  * limitations under the License.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
  *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
  */
 
 package org.onosproject.net.behaviour;
@@ -40,4 +38,4 @@
      */
     @Deprecated
     List<PortDescription> getPorts();
-}
\ No newline at end of file
+}