If a test requires Galera but it is not available, it is now skipped. All
tests that explicitly use the `test.galera` member as well as all tests
that use a Galera configuration now require that Galera is present.
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.
Streamlined the test to perform as much testing as fast as possible. The
gradual ramp up did not provide any concrete benefits compared to testing
everything at once.
Replaced structures with C++11 alternatives where possible and removed
unused, redundant or dead code.
