Factorize python and dumper configs

This is an attempt to include some flags/options to the job steering python scripts in the json configuration files.

One proposed idea from @dguest is to add a top "dumper" layer in the structure of the json configs, like:

{
  "ignore_something": true,
  "dumpster": {
    "file": "someOtherCompleteDumpsterConfig.json"
  }
}