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/modules.defs b/modules.defs
index 71f70c0..1727ab5 100644
--- a/modules.defs
+++ b/modules.defs
@@ -3,6 +3,7 @@
     '//utils/junit:onlab-junit',
     '//utils/misc:onlab-misc',
     '//utils/rest:onlab-rest',
+    '//tools/build/conf:onos-build-conf',
 ]
 
 API = [