Added endpoint to browse Locations
Added endpoint to browse Locations

refs #5427

api/v1/location/<location_uuid>/browse/ will return all non-hidden
entries in a directory.  path=<path> will display a sub-path of that
Location.

artefactual/archivematica-storage-service,artefactual/archivematica-storage-service,artefactual/archivematica-storage-service,artefactual/archivematica-storage-service