Fix issue with package loader

Pagination for Catalog API was introduced in change
If71da70fa835a1ee7a271ebf7238c0a4c64d4123
but package loader was not updated to handle changed
result type for call to GET /catalog/packages

Change-Id: If79efe560801bb33a36e2b0032a71cdbe191fb03
Closes-bug: #1325365