Add tests from develop

Added tests from develop. The test results need to be modified for 2.0.

maxscale-system-test/local_tests/create_repl_user.sql

@@ -0,0 +1,4 @@
+#create user repl@'%' identified by 'repl';
+grant replication slave on *.* to repl@'%' identified by 'repl';
+
+FLUSH PRIVILEGES;