MXS-1561 Switchover to bad master

auto_failover=true
auto_rejoin=false

This test tests the following:

- Regular master-slave setup
- Create a table, insert some data
- Sync all slaves
- Stop a slave
- Insert some more data
- Sync remaining slaves
- Stop the master
- Expect the failover mechanism to pick a new master (server2)
- Bring up the slave
- Perform a switchover from server2 to server4
- Should fail

Currently it does fail, but only due to a timeout.

    [mysqlmon] MASTER_GTID_WAIT() timed out on slave 'server4'.

There should be some check that would ensure that the failure happens
faster than that.

maxscale-system-test/.gitignore

@@ -105,6 +105,7 @@ max_connections
 maxscale_process_user
 mm
 mm_mysqlmon
+mysqlmon_failover_bad_master
 mysqlmon_failover_manual
 mysqlmon_failover_manual2_4
 mysqlmon_failover_manual2_3