Code review comment for lp:~dooferlad/linaro-image-tools/copy-files-new-syntax

Just for the record, I don't think such extreme refactoring was required, and it being started, is not complete - instead of moving entire file processing to be package based and happen on the level of linaro-media-create, this still leaves bootloader.file, bootloader.spl_file as it was, just flips copy_files handling - instead of being done consistent with how bootloader.file/bootloader.spl_file works, it is now package based, but that means we have file-extraction code spread around both linaro-hwpack-create and linaro-media-create.

But for the purpose of having it done, it's ok.

(more comments to come.)