Fix checkstyle errors when building archetype-generated apps

Checkstyle validation is now enabled by default in onos-dependencies
(archetypes' parent pom). We also add a reference to the archetypes' pom
to disable checkstyle, if needed.

Change-Id: I9b6e6cecf2d704f52ec1f118eae2aafd03cf0b9a
diff --git a/tools/package/archetypes/bundle/pom.xml b/tools/package/archetypes/bundle/pom.xml
index 62c12ba..95cd2d4 100644
--- a/tools/package/archetypes/bundle/pom.xml
+++ b/tools/package/archetypes/bundle/pom.xml
@@ -14,8 +14,10 @@
   ~ See the License for the specific language governing permissions and
   ~ limitations under the License.
   -->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-  <modelVersion>4.0.0</modelVersion>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
 
   <parent>
     <groupId>org.onosproject</groupId>