mysql_client_test: don't use 192.168.0.1
mysql_client_test: don't use 192.168.0.1

the test expects 192.168.0.1 not to resolve to anything.
this is a fragile assumption. use 127.0.0.2 instead
(which only marginally better)

natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2,natsys/mariadb_10.2