RPM Support

When syncing a yum repo, the 'results' hash which contains:

"added_count"=>0,
"removed_count"=>0,
"updated_count"=>0,

is all 0 even if units are synced.

Steps to reproduce:
a) create a yum repo pointing to some feed with at least one package
b) sync the repo
c) examine the task output:

  "result"=>
       {"result"=>"success",
        "importer_id"=>{"$oid"=>"56af754a0555153b7f89d879"},
        "exception"=>nil,
        "repo_id"=>"Default_Organization-tester-tester",
        "traceback"=>nil,
        "started"=>"2016-02-01T15:10:37Z",
        "_ns"=>"repo_sync_results",
        "completed"=>"2016-02-01T15:11:20Z",
        "importer_type_id"=>"yum_importer",
        "error_message"=>nil,
        "summary"=>
         {"content"=>{"state"=>"FINISHED"},
          "comps"=>{"state"=>"FINISHED"},
          "distribution"=>{"state"=>"FINISHED"},
          "errata"=>{"state"=>"FINISHED"},
          "metadata"=>{"state"=>"FINISHED"}},
        "added_count"=>0,
        "removed_count"=>0,
        "updated_count"=>0,
        "id"=>"56af75980555153c4bd1774e",
        "details"=>
         {"content"=>
           {"size_total"=>103477800,
            "items_left"=>0,
            "items_total"=>367,
            "state"=>"FINISHED",
            "size_left"=>0,
            "details"=>
             {"rpm_total"=>367,
              "rpm_done"=>367,
              "drpm_total"=>0,
              "drpm_done"=>0},
            "error_details"=>[]},
          "comps"=>{"state"=>"FINISHED"},
          "distribution"=>
           {"items_total"=>0,
            "state"=>"FINISHED",
            "error_details"=>[],
            "items_left"=>0},
          "errata"=>{"state"=>"FINISHED"},
          "metadata"=>{"state"=>"FINISHED"}}},
      "error"=>nil,
      "_id"=>{"$oid"=>"56af756ddeeba77d7fad3d51"},
      "id"=>"56af756ddeeba77d7fad3d51"},