MySQL: Add support of SSL in MySQL

Launch SSL dissector when MySQL switch to SSL

Ping-Bug:9515
Bug:10338
Change-Id: I96487d6d2131db3678f4a24095d702b6cd4ea5b2
Reviewed-on: https://code.wireshark.org/review/3411
Reviewed-by: Daniël van Eeden <wireshark@myname.nl>
Reviewed-by: Anders Broman <a.broman58@gmail.com>