allowing the ability to set the discovery_permissions

Looking for the ability to set and get the discover_permission without redefining the method like here:  https://github.com/psu-stewardship/hydra-collections/blob/master/lib/hydra/collections/selects_collections.rb#L26-L27

The use case:  
I am a user who wants to add a public document to my collection.
The system needs to find all collections I can edit
while in the Catalog controller looking at all public and read documents.