Embedded JNDI should support authentication

The embedded JNDI provider should require users to be
authenticated, if security is enabled.

Authentication should be done via the standard JNDI
properties, Context.SECURITY_PRINCIPAL and
Context.SECURITY_CREDENTIALS

For convenience, the same principal and credentials
could also be used for the no-arg
TopicConnectionFactory.createTopicConnection() and
QueueConnectionFactory.createQueueConnection()
methods.