refs #7779 - Updating to add support for pulp crane

This is the initial PR to add the puppet-crane module.

This module does a simple config of the Pulp Crane application.
This means they're hardcoded. I'd at least set it to ```$crane::cert```, but also strongly consider adding them as class parameters:
```puppet
class crane::apache (
  $cert = $crane::cert,
  $key  = $crane::key,
  $ca   = $crane::ca,
) {
```

The benefit is that you can easily test this class without including the crane class and still pass in various parameters. That helps with performance. It can also help you when you use templates because they're already in scope and there's no need for the clunky ```scope.lookup``` function.