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.
The test can fail if the Galera nodes aren't synced when the connection to
MaxScale is made. Adding a small sleep should allow the Galera cluster to
stabilize after the configuration switch.
