Make JaasSecurityDomain a bean

Just the way XMLLoginConfig was made into a bean with an additional @JMX annotation, JaasSecurityDomain needs to be made into a bean. Any internal attributes that use ObjectNames (if any) need to be injectable.

The AS test suite has usage of JaasSecurityDomain as an MBean Service. Just replace some of them into beans and leave the rest as services such that we test both usage.