* Defined global var for holding default metric groups * Refactor removeGroup() to work with the whitelist * Refactor TestRemoveGroup()
* Now the user selects what to push instead of what not * Required to check and improve tests * Missing checks in the code when MetricsCol is empty
The plugin is able to query a Mesos master and push the metrics, a blacklist can be configured and a timeout, it's still not used. Added unit test, might be a good idea to have system test using docker.