[Groovy] Class JmxBeanExportFactory

This factory returns a container node for all other nodes that are used to collect meta data for resources that are exported to the MBeanServer for management.

Supported syntax:

 def jmx = new JmxBuilder()
 jmx.export(registrationPolicy:"replace|ignore|error") {
     bean(...)
 }
 

registrationPolicy indicates how resources will be registered: "replace" - replaces existing bean,
"ignore" - ignores the registration request if bean already exists.
"error" - throws error if bean is already registered.