Fixes collision with puppetlabs/apt

The below error occurs on 12.04 with the most recent versions of everything.

Error: Failed to apply catalog: Duplicate declaration: File[/etc/apt/sources.list.d] is already declared in file /etc/puppet/modules/apt/manifests/init.pp:80; cannot redeclare
Facter fact $fqdn may not exist

See: https://projects.puppetlabs.com/issues/7484
Manually add PPA key
Hostname > fqdn
Comma puppet-style
Rescoped template variables
Merge pull request #1 from an0nym0use/master

Fixes collision with puppetlabs/apt