Standardize output passing to match expected CMA format

[reweeden]

The standard way that cumulus tasks operate is that they expect to pass a payload object around that has a "granules" key and possibly some other keys. The default cumulus message config used if you don't specify an override is meant to work with tasks out of the box and would look like this:

"task_config": {
  "cumulus_message": {
    "outputs": [
      {
        "source": "{$}",
        "destination": "{$.payload}"
      }
    ]
  }
}

Right now in order to use this task, you have to override the default cumulus message processing to set the output like this:

"task_config": {
  "cumulus_message": {
    "outputs": [
      {
        "source": "{$.input}",
        "destination": "{$.payload}"
      }
    ]
  }
}

After these changes you will be able to use this task without setting any special cumulus message config.