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/bucklets/onos.bucklet b/bucklets/onos.bucklet
index f34e657..d6e8b7f 100644
--- a/bucklets/onos.bucklet
+++ b/bucklets/onos.bucklet
@@ -35,7 +35,9 @@
         sh_test(
                 name = name + '-checkstyle',
                 test = '//tools/build/conf:start-buck-daemon',
-                deps = [ jar_target, '//tools/build/conf:onos-java-header' ],
+                deps = [ jar_target,
+                         '//tools/build/conf:onos-java-header',
+                         '//tools/build/conf:onos-build-conf', ],
                 args = [
                     '$(location //tools/build/conf:buck-daemon-jar)',
                     'checkstyle',