Fix COOK-3931, COOK-3945, COOK-3966, COOK-3974, COOK-4001 re: debian/ubuntu installation

Commits:

    [COOK 3974] Template out debian.cnf file before issuing restart
    [COOK 4001] only create /etc/init/mysql.conf on the ubuntu platform
    [COOK 3931] Move ubuntu-12 init-mysql.conf.erb template to default specificity
    Run specs on Ubuntu 13.04

Fixes the following COOK tickets:

- COOK-3931
- COOK-3945
- COOK-3966
- COOK-3974
- COOK-4001

Consolidated PRs:

- opscode-cookbooks/mysql#128
- opscode-cookbooks/mysql#132
- opscode-cookbooks/mysql#137
- opscode-cookbooks/mysql#144
- opscode-cookbooks/mysql#146

*Please* merge this in sooner rather than later.