MDEV-23576 : galera_3nodes.galera_ipv6_mysqldump MTR failed: WSREP_SST:...

MDEV-23576 : galera_3nodes.galera_ipv6_mysqldump MTR failed: WSREP_SST: [ERROR] rsync daemon port '16008' has been taken

Add force_restart to clean up rsync daemon port.

mysql-test/suite/galera_3nodes/t/galera_ipv6_mysqldump.test

 --source include/galera_cluster.inc
 --source include/check_ipv6.inc
+--source include/force_restart.inc
 
 call mtr.add_suppression("WSREP: wsrep_sst_method is set to 'mysqldump' yet mysqld bind_address is set to'");
 call mtr.add_suppression("Failed to load slave replication state from table mysql.gtid_slave_pos");