[Review] Request from 'schubi2' @ 'yast/yast-autoinstallation/review_140806_export_deleted_package_selection'

Please review the following changes:
  * da63299 packaging
  * 4d4ec19 export removed packages correctly

better way is to split it to two operation - select package and map it to its name:
```
removepackages = Pkg.ResolvableProperties("", :package, "").select do |package|
  package["transact_by"] == :user && (package["locked"] == true || package["status"] == :available)
end
removepackages.map! {|p| p["name"] }