[MCHECKSTYLE-353] - Don't resolve any dependencies

Not sure why resolving dependencies is needed for running Checkstyle, it
does slow down the build considerably. For Apache Camel this makes a
ten fold difference from ~20mins to ~2mins for running
`mvn checkstyle:check`.

Seems this was introduced with MCHECKSTYLE-163 but subsequently
integration test was removed in MCHECKSTYLE-272 (#42).

src/main/java/org/apache/maven/plugins/checkstyle/CheckstyleViolationCheckMojo.java

@@ -73,7 +73,7 @@
  * @author <a href="mailto:joakim@erdfelt.net">Joakim Erdfelt</a>
  * @version $Id$
  */
-@Mojo( name = "check", defaultPhase = LifecyclePhase.VERIFY, requiresDependencyResolution = ResolutionScope.TEST,
+@Mojo( name = "check", defaultPhase = LifecyclePhase.VERIFY, requiresDependencyResolution = ResolutionScope.NONE,
        threadSafe = true )
 public class CheckstyleViolationCheckMojo
     extends AbstractMojo