Use buck version of checkstyle rules in maven build

- build and package the checkstyle rules in the onos-build-conf artifact
- modify maven build to use new version of artifact
- fix checkstyle problems in maven-only code

Change-Id: I4e4dc890ca909e47463629c732a2fc5335bb4d2a
diff --git a/apps/kafka-integration/api/src/main/java/org/onosproject/kafkaintegration/api/dto/OnosEvent.java b/apps/kafka-integration/api/src/main/java/org/onosproject/kafkaintegration/api/dto/OnosEvent.java
index 3f4993a..d827e7b 100644
--- a/apps/kafka-integration/api/src/main/java/org/onosproject/kafkaintegration/api/dto/OnosEvent.java
+++ b/apps/kafka-integration/api/src/main/java/org/onosproject/kafkaintegration/api/dto/OnosEvent.java
@@ -1,11 +1,12 @@
-/**
+/*
  * 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
-
+ *
+ *     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.