Fix: mysql2 query argument order compatibility

[bryanvaz]

Issue #: #380

Description of changes:

Fixes issue with mysql2 driver where x-ray monkey patch forconnection.query and connection.execute incorrectly parsed arguments. Specificlly mysql2 argument order is:

• 1st argument is of type Object;
• 2nd argument is an array of values for binding to sql query; and
• 3rd argument is callback.

Unit tests added:

1. Tests if arguments are correctly parsed and sent to base mysql2 query driver

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[willarmiros]

Looks good to me, will be compatible with existing MySQL behavior and add better support for MySQL2. Thanks!

[bryanvaz]

Should also fix sidorares/node-mysql2#1010