Sleep longer in mysqlmon_* tests

Increased the amount of time that the tests sleep while they wait for
states to change. This should make them more tolerant of server load by
allowing more time for things to settle down.

maxscale-system-test/mysqlmon_rejoin_good.cpp

@@ -81,7 +81,7 @@ int main(int argc, char** argv)
         int ec;
         test.maxscales->ssh_node_output(0, "maxadmin call command mysqlmon switchover "
                                         "MySQL-Monitor server1 server2" , true, &ec);
-        sleep(5); // Wait for monitor to update status
+        sleep(10); // Wait for monitor to update status
         get_output(test);
         master_id = get_master_server_id(test);
         test.assert(master_id == old_master_id, "Switchover back to server1 failed.");