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.
Added test cases that verify that the functionality works as
expected. Also made Mariadb_nodes::change_master less verbose when one of
the nodes is down.
