by apt to perform package validation. Apt has it's own GPG keyring that can
be manipulated through the `apt-key` command.
- apt_key { '4BD6EC30':
+ apt_key { '6F6B15509CF8E59E6E469F327F438280EF8D349F':
source => 'http://apt.puppetlabs.com/pubkey.gpg'
}