Don't ingest descriptions from PreviewNetworks

These are actually reviews, so shouldn't be ingested as descriptions
 - Add missing properties used by the Radioplayer upload that weren't added to environment.properties.
 - Ensure the 'adult' flag on Channel is merged to any existing channel when writing.
Remove admin interface
Merge pull request #436 from atlasapi/mbst-7812-remove-old-admin-interface

Remove admin interface
write equivalence assertions to queue via EquivalenceResultHandler
Merge branch 'mbst-7857-equiv-content-store' into stage

* mbst-7857-equiv-content-store:
  write equivalence assertions to queue via EquivalenceResultHandler
  Remove admin interface
  - Add missing properties used by the Radioplayer upload that weren't added to environment.properties.  - Ensure the 'adult' flag on Channel is merged to any existing channel when writing.
  Don't ingest descriptions from PreviewNetworks