ZF2-297: Pdo_Mysql host connection parameter is not used

Description

Zend\Db\Adapter\Driver\Pdo\Connection uses hostname in DSN instead of host for Pdo_Mysql

Comments

I added a pull request that fixes this:

https://github.com/zendframework/zf2/pull/1211

This is my first (attempts at github, and pull request) so let me know if there was anything I should have done differently

This is no longer a problem, PR 1221 set host as default.