adding unit tests for the "purge" module
Merge pull request #272 from pulp/mhrivnak-unittest-purge

adding unit tests for the "purge" module
Merge branch 'rbarlow-consumer_profile_hashing' into pulp-2.2.1
Merge branch 'pulp-2.2' into pulp-2.2.1
Merge branch 'pulp-2.2.1'