Mysqli: Allow secure connections using SSL

The current driver has no option to allow the usage of SSL connections on mysql. I've used the same name params as mysql client.
An example of mysql client usage would be:

mysql --ssl-ca='path_to_ca.pem' --ssl-cert='path_to_client_cert.pem' --ssl-key='path_to_client_key.pem'

refactor secure connection as params

remove space

add space

refactor secure connection

rename method

rename method

docs: add ssl params to use in mysqli driver

rename test method

refactor method setSecureConnection

fix bug

add comment to method

remove string escaping

MasterSlaveConnection::connect: Remove dead code

[DBAL-2508] Pass through index options when renaming index on table

[DBAL-2555] Fix date and datetimetz type mapping on Oracle

[DBAL-2511] Fix type list extraction in connection update method

[DBAL-2586] Fix current date and time SQL generation on SQL Server

[DBAL-2595] Remove fragile test that cannot be abstracted across PostgreSQL versions

[DBAL-2595] Fix retrieving last insert ID for FQN sequence name with OCI8

[DBAL-2594] Mark commented types implicitly

Hotfix 2313 infinite loop

IBM_DB2 platform doesn't handle offset without limit

Oracle platform ignores OFFSET in case if LIMIT is not specified

URL-decode URL-style DSN

add postgresql: "9.6"

Fix parameter list expansion inside PostgreSQL arrays

Fixed ORA-01427 when listing columns

Escape to the global namespace under custom namespaces

Replacing spaces in the pgsql dsn string with semicolons as this is m…

Corrected styling around the GUID type in the types documentation

guid type not bolded

Fix a notice during tests if not realized with pgsql

Removes support for PHP 5.x