move the custom 'conf' attribute to config.d

Make it so that it will just be an override to the existing my.cnf
Sort and clean mysql configs

* remove all comments
* sorted configs per category for easy diffs
Allow custom config with to handle keys without values
tighten config spacing
Merge pull request #2 from smartbombinteractive/feature/70-reconcile-prod-mysql-conf-with-chef-generated-make-chef-match-prod

Feature/70 reconcile prod mysql conf with chef generated make chef match prod