Provide a parseable report about generated contents

[kdelee]

It would be very useful if pulp-fixtures generated some kind of metadata about the generated content that is used in pulp-smash like how many content units are in a repo, the name, version, checksum, etc of these content units.

This could be used to replace many of the values hard coded into pulp smash constants file [0].

[0] https://github.com/PulpQE/pulp-smash/blob/master/pulp_smash/constants.py