Don't require daemon config in arquillian.xml [SWARM-138]

And fall back to defaults if no settings are provided.

arquillian/daemon/api/src/main/java/org/wildfly/swarm/arquillian/daemon/container/DaemonContainerConfigurationBase.java

@@ -36,10 +36,10 @@ public class DaemonContainerConfigurationBase implements ContainerConfiguration
     @Override
     public void validate() throws ConfigurationException {
         if (host == null || host.length() == 0) {
-            throw new ConfigurationException("host must be specified");
+            this.host = "localhost";
         }
         if (port == null || port.length() == 0) {
-            throw new ConfigurationException("port must be specified");
+            this.port = "12345";
         }
     }