Works with "yum" cookbook v3.0, which removed support for yum_key, and for which yum_repository has different argus.  In addition to recipes/package_repo.rb, Berksfile and metadata.rb has been updated
Uses non-hardcoded names for packages, new variables node["percona"]["server"]["package"] and node["percona"]["server"]["shared_pkg"]
Merge branch 'non-hardcoded-package-names'