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 4b2d913..31c19f3 100644
--- a/tools/package/archetypes/bundle/pom.xml
+++ b/tools/package/archetypes/bundle/pom.xml
@@ -14,18 +14,34 @@
   ~ 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>
-    <artifactId>onos-archetypes</artifactId>
-    <version>2.2.1-SNAPSHOT</version>
-  </parent>
+    <parent>
+        <groupId>org.onosproject</groupId>
+        <artifactId>onos-archetypes</artifactId>
+        <version>2.2.1-SNAPSHOT</version>
+    </parent>
 
-  <artifactId>onos-bundle-archetype</artifactId>
-  <packaging>maven-archetype</packaging>
+    <artifactId>onos-bundle-archetype</artifactId>
+    <packaging>maven-archetype</packaging>
 
-  <description>ONOS OSGi bundle archetype</description>
+    <description>ONOS OSGi bundle archetype</description>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <!-- Uncomment to disable checkstyle validation
+                <configuration>
+                    <skip>true</skip>
+                </configuration>
+                -->
+            </plugin>
+        </plugins>
+    </build>
 
 </project>