Implemented haproxy 1.5 with SSL offloading

This feature was only added to Ubuntu.  However, once
HA Proxy supports SSL others can benefit from it.  I
wanted to upstream this change, I didn't want to keep
it behind the walls of my co, especially since it will
be relevant in the future.

* Added the apt module.  Once apt was added tests would
  not pass without stdlib.
* Needed to adjust the frontend tests.  The testing
  framework detects extra new lines with the addition of
  the branching (even though trailing newlines are
  removed).
* Standardized the manifest's docs, since I was trying
  to copy the existing format.
* I was unable to figure out how to test the `apt::key`
  and `apt::ppa` sections of init.pp.