See script directory for method. The script to run in the top level
MaxScale directory is called maxscale-uncrustify.sh, which uses
another script, list-src, from the same directory (so you need to set
your PATH). The uncrustify version was 0.66.
The schemarouter should always use Backend::write for communication with
the backend servers. This keeps the backends in the correct state.
This fix solves some of the random test failures in the `sharding` test.
