Fix JAX-WS 2.2 webserviceref clarification

There are some clarifications in JAX-WS 2.2 specification that are causing webserviceref TCK6 failures.

diff -r 2.2/javax/xml/ws/WebServiceRef.java 2.1/javax/xml/ws/WebServiceRef.java
68,131c31,78
< Class<? extends Service> value() default Service.class;
> Class value() default Object.class ;