Deployment descriptor support for declaring jbossws-config-file / jbossws-config-name

The jaxws endpoint configuration is currently declared through the @EndpointConfig annotation. The jbossws-native used to support declaring the same through context-params in the servlet web.xml. We should allow the same, also using the same configuration that is already included and parsed in jboss-webservices.xml (for ejb deployments too).