Fixing stock tasks

Some stock tasks required fixing due to the migration from RAZOR-154. This file movement means the user does not need to rename any tasks.
Link repo to task

The association between a repo and a task should not be indirect through the policy. Repo requires an association to task. Policy has an optional association to task, which will help with backward-compatibility.

Fixes https://tickets.puppetlabs.com/browse/RAZOR-143