Add support for puppetlabs-mysql 2.2

Puppetlabs-mysql has been rewritten to be much
cleaner. This patch adds a new parameter for the
heat 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: I4d268d793740c31493acd5999dd3f8501cc1d281