Support modules in `compose_utils.diff`.
    
    The `compose_utils.diff` is currently not useful when creating diff
    of two composes with modules. The issue is that such composes often
    contains multiple RPMs with the same name comming from different
    modules (or even from non-modular part of the compose).
    
    Currently, the `compose_utils.diff` shows all changes in `$name.$arch`
    format. This PR changes this in a way that RPMs comming from modules
    are showed in the `$name.$module_name_stream.$arch` format.