Log Message:
mysql56-client: change the default configuration to avoid information
disclosure to a malicious server.

Backport of upstream commit:
https://github.com/mysql/mysql-server/commit/98ed3d8bc8ad724686d26c7bf98dced3bd1777be

Exploit method described here:
https://gwillem.gitlab.io/2019/01/17/adminer-4.6.2-file-disclosure-vulnerability/