Handle MariaDB-11.4+ zero configuration SSL verification

[grooverdan]

Feature: https://mariadb.org/mission-impossible-zero-configuration-ssl/

List of references in: https://jira.mariadb.org/browse/MDEV-33639

Seems to involving the OK packet received at: https://github.com/blackbeam/rust-mysql-simple/blob/master/src/conn/mod.rs#L835

Will probably require this server fix https://jira.mariadb.org/browse/MDEV-33592 for Rust compatibility.

[rusher]

see https://mariadb.com/kb/en/mariadb-protocol-differences-with-mysql/#zero-configuration-ssl doc