Distributed availability groups are loosely coupled, which in this case means that they don't require a single WSFC and they're maintained by SQL Server. Because the WSFCs are maintained individually ...

Address #100 by adding support for MariaDB (@green-coder). Set NEXT_JDBC_TEST_MARIADB=true as well as NEXT_JDBC_TEST_MYSQL=true in order to run tests against MariaDB.