Some existing tests set gtid_mode using include/rpl_set_gtid_mode.inc,
and some set gtid_mode using include/rpl_restart_server.inc, and some
use --gtid-mode on the command line.
Before this patch, rpl_set_gtid_mode.inc requires a restart.
This patch changes the following:
- rpl_set_gtid_mode.inc does not restart.
- Tests that call rpl_set_gtid_mode.inc because they need to use
gtid_mode=on all the time use include/have_gtid.inc instead
- Tests that use rpl_restart_server.inc only to change gtid_mode now use
rpl_set_gtid_mode.inc instead.
- Removes --gtid-mode from the command line.