Create a service compliance report in Catalog

[mwengren]

Placeholder issue to consider replicating some Service Monitor functionality in Catalog/CKAN.

Create a background job to pull THREDDS/ERDDAP dataset attribution and run Compliance Checker reports.

We could add a CKAN extension or custom view to show the checker output, either dataset by dataset, or aggregated by Organization somehow. Compliance Checker jobs run in background by schedule (weekly) or as offshoot of harvest job.

[mwengren]

Related to ioos/catalog#60. Issue 60 is more about service health (uptime), whereas this task would create a dataset compliance report.

It's possible we could build in a service health check in the same UI/framework though in Catalog.