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/pom.xml b/pom.xml
index e4af6a6..a8162c7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -51,6 +51,7 @@
 
     <modules>
         <module>lib</module>
+        <module>tools/build/conf</module>
 
         <module>utils</module>
         <module>core</module>