Generate copyright year in swagger template code

- exclude generated source code from checkstyle by default

Change-Id: I3f79183a8aae1f24d36558860555b5b0298cd8c3
diff --git a/tools/build/buck-plugin/src/main/resources/registrator.javat b/tools/build/buck-plugin/src/main/resources/registrator.javat
index 703feb2..6596450 100644
--- a/tools/build/buck-plugin/src/main/resources/registrator.javat
+++ b/tools/build/buck-plugin/src/main/resources/registrator.javat
@@ -1,7 +1,5 @@
 /*
- * Auto-generated by OnosSwaggerMojo.
- *
- * Copyright 2016-present Open Networking Foundation
+ * Copyright ${year}-present Open Networking Foundation
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,6 +12,9 @@
  * 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.
+ *
+ * Auto-generated by OnosSwaggerMojo.
+ *
  */
 package ${api.package};