Add tests for required_packages change
Add tests for required_packages change

This updates the tests for the apt::source defined type to use the new name for
the exec resource and the new parameter for the same exec.

gizmoguy/puppetlabs-apt,gwdg/puppetlabs-apt,puppetlabs/puppetlabs-apt,imphil/puppetlabs-apt,zoide/puppet-apt,imphil/puppetlabs-apt