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/providers/bgp/cli/src/main/java/org/onosproject/bgp/cli/package-info.java b/providers/bgp/cli/src/main/java/org/onosproject/bgp/cli/package-info.java
index 10d3b8c..6b14669 100644
--- a/providers/bgp/cli/src/main/java/org/onosproject/bgp/cli/package-info.java
+++ b/providers/bgp/cli/src/main/java/org/onosproject/bgp/cli/package-info.java
@@ -1,4 +1,20 @@
+/*
+ * 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.
+ */
+
 /**
  * Created by root1 on 23/8/16.
  */
-package org.onosproject.bgp.cli;
\ No newline at end of file
+package org.onosproject.bgp.cli;