Discovering statistics and integrating them into execution

The plugin has two discovery parameters, which will allow us to discover statistics, which can then be incorporated in a conf file, to monitor them.

--list_mbeans 
This parameter allows us to list all the mbeans on our server, e.g. :

--list_attr

If this parameter is used, with the name of one of the mbeans listed by the plugin, it will list all the attributes of the mbean, i.e. each statistic, which can then be defined in conf