[NEW] Add support for SSL in the MySQL database connection.
Recommended for cloud implementations, e.g. Azure.
Implementation will scan for key files in the db/cert folder. If found SSL is activated.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@47304 b456876b-0849-0410-b77d-98878d47e9d5