Fix testing

[jmesnil]

I reverted https://github.com/darranl/wildfly-archetypes/pull/5/files as the tests where failing:

[INFO] Error: Could not find or load main class ${server.jvm.args}
[INFO] Caused by: java.lang.ClassNotFoundException: ${server.jvm.args}
[INFO] [ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.36 s <<< FAILURE! - in org.wildfly.examples.GettingStartedApplicationIT
[INFO] [ERROR] org.wildfly.examples.GettingStartedApplicationIT  Time elapsed: 0.36 s  <<< ERROR!
[INFO] org.jboss.arquillian.container.spi.client.container.LifecycleException: The java process starting the managed server exited unexpectedly with code [1]
[INFO]

The verify goal was missing from the failsafe configuration and Maven was not exiting with an error.

I also updated the Service test to use Arquillian to properly test the CDI bean.