a small performance improvement in applicability generation to get the profile from existing_applicability instead of looking up in the db when existing_applicability is not None
few more improvements to applicability generation code to reduce memory footprint when calculating applicability by repos
using find_one instead of find on the collection so that it returns None if there is no matching object
Merge pull request #589 from pulp/skarmark-applicability

a few more performance improvements in applicability generation to reduce memory footprint