[COOK-3390] Create directory /etc/mysql

https://tickets.opscode.com/browse/COOK-3390

This is because when I did an (for cleanup and test cookbook):

aptitude purge mysql-client mysql-common mysql-server mysql-server-5.5
rm -R /var/lib/mysql/
rm -R /etc/mysql/
mkdir /etc/mysql

chef-client runs stops at template "#{node['mysql']['conf_dir']}/debian.cnf" do

because /etc/mysql is not present.

I think that it is wrong. And Author should check a directory in recipe and fix it recipe.

Thank you.

Client ubuntu 12.04.2 with all updates