Small change to default config for Docker-specific rpm package

Syncs "official" and our own Docker images

packaging/rpm-docker/my.cnf

@@ -17,6 +17,8 @@
 # join_buffer_size = 128M
 # sort_buffer_size = 2M
 # read_rnd_buffer_size = 2M
+skip-host-cache
+skip-name-resolve
 datadir=/var/lib/mysql
 socket=/var/lib/mysql/mysql.sock
 secure-file-priv=/var/lib/mysql-files