[Config] expose config via JMX bean

It would be nice if the Configuration of an application could be exposed via JMX bean.

Currently there is no easy way to have the Ops team look how an application is configured.
This is not about checking a single configured value but the whole configuration system!

I've built a JSF page for a customer which gets copied around from one project to the other.
But it would be much better to expose those values via JMX by default. That way we would not need any user interface part, not much security (JMX is secured anyway), no JSF, etc.

What information does get exposed?

1.) The list of all picked up ConfigSources + their ordinals. Of course already sorted

2.) All configured values.

• their key
• their 'native' value (without variables, etc)
• the ConfigSource from which the value effectively got picked up
• Map of all the ConfigSources containing the key + the values which got resolved on each level.

With this information the Ops team can perform the right tweaks much more easily.