Add support for puppetlabs-mysql 2.2

Puppetlabs-mysql has been rewritten to be much
cleaner. This patch adds a new parameter for the
keystone mysql and init classes allowing users to
use the new version. Previous behavior will continue
as normal when using the old version (0.9)

Change-Id: Idf7c46d9aab8db7cca7d8377431c60b24ae4c9c6
Closes-bug: #1266241
Merge "Add support for puppetlabs-mysql 2.2"