Support AuthenticationClient within deployment

This may actually be bigger than just security but for now this is more security related.

The Elytron subsystem supports associating an AuthenticationContext with the classloader of every deployment - we should take this one step further and consider if the deployment contains a wildfly-config.xml use the configuration it contains instead.

We may want one additional feature however and instead see if we can combine together and maybe even allow the deployment defined config to use the managed credential store.