WFLY-2642 Add Resteasy Spring Integration

This will add the resteasy-spring.jar as a resource root, if either of the
SpringContextLoaderListener or Spring DispatcherServlet is present in the deployment.

This integration can be disabled by setting a context param
in web.xml with a name of org.jboss.as.jaxrs.disableSpringIntegration
and a value of true.