* Instead of having 4 options controlling purging we now have a single
hash with four possible keys.
* Include `apt::update` only _after_ we've assembled the `$_update`
hash.
- fix spec tests to include osfamily fact
- add spec tests to verify current default behavior unimpacted.
- manage the update-stamp file in puppet via content rather than a served file.
- update custom fact to return -1 if the file doesn't exist
- add spec test for custom fact
- refactor to use a variable vs a collector/override
- document parameters a bit more verbosely
- remove empty unconstrained fact
- Add osfamily fact to backports tests to facilitate functional tests on non-debian hosts
Move apt-get update exec to a seperate class to minimize the number of
apt-get updates invoked by configuration changes.
* remove apt_update exec resource in apt class.
* remove apt-get-${name} in defines.
* apt::source notify Exec['apt update'].
* Remove dependency to Exec['apt_update'].
* fix rspec-puppet tests.
Conflicts:
manifests/source.pp
