Change positional arguments given by keyword
Change positional arguments given by keyword

The functions ``get_model()`` and ``get_plugin()`` from ``statscache.utils``
were being called with their final positional arguments supplied as keyword
arguments. Although it works just fine, it is redundant (``config=config``) and
a bit confusing.

yazman/statscache,yazman/statscache,yazman/statscache