pulp - updates for repo copy and retrieving packages

This PR has a couple of small changes:
1. update to use newer version of runcible (0.4.3)
2. update to repo copy logic to take advantage of pulp chgs (ref: https://bugzilla.redhat.com/show_bug.cgi?id=953665)
3. when retrieving repo rpms from pulp, specify the fields to retrieve (this is to avoid pulling many gigs of data for a large repo)
4. new set of vcr cassettes