Include configuration files in Cluster Support Bundle

## What?
It would be beneficial if the Cluster Support Bundle included the server.conf/gralog.conf file.
It would be a bonus if it also included the Graylog JVM settings:
/etc/default/graylog-server/jvm.options

## Why?
Including the config files would save time for both the support team and the customer when troubleshooting.

## Your Environment
Would be beneficial for any environment