Upgrade to JadConfig 0.7.0
Add CLI parameters to dump the configuration of graylog2-radio

The following CLI parameters have been implemented:

* `--dump-default-config` dumps the default configuration as defined per default values in the `Configuration` class.
* `--dump-config` dumps the effective configuration after processing the config file.

fixes #616
Add CLI parameters to dump the configuration of graylog2-server

The following CLI parameters have been implemented:

* `--dump-default-config` dumps the default configuration as defined per default values in the `Configuration` class.
* `--dump-config` dumps the effective configuration after processing the config file.

fixes #616