Allow configuration of JaxWsClientFactoryBean during port creation

Many of the model factory bean allow for configuration using a Configurer instance plugged into the Bus as extension. This is actually a really cool thing. During the port creation process (client side, org.apache.cxf.jaxws.ServiceImpl class), it's currently possible to configure the JaxWsProxyFactoryBean, the Service and the JaxWsEndpointImpl. It would be good to allow for configuration of the JaxWsClientFactoryBean too before it's used to create the Service.
This basically means adding just another hook to the Configurer installed in the bus.