checkstyle rule to check copyrights

Change-Id: Ia9bab40b5fe64fca539058a4316371f7acc0f387
diff --git a/tools/build/conf/src/main/resources/onos/onos-java.header b/tools/build/conf/src/main/resources/onos/onos-java.header
new file mode 100644
index 0000000..7feabd2
--- /dev/null
+++ b/tools/build/conf/src/main/resources/onos/onos-java.header
@@ -0,0 +1,4 @@
+/*
+ * Copyright 201[0-9].* Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 \(the "License"\);