Tweak validation output.
Tweak validation output.

Return `dcat_validation` in the format:

{
"url": "harvest source url",
"last_validation": "harvest_job.gather_finished",
"result": {
  "errors": error count,
  "warnings": warning count,
  "resources": ["list of errors as we have now"]
  }
}

okfn/ckanext-sweden,okfn/ckanext-sweden,okfn/ckanext-sweden,okfn/ckanext-sweden