Alert if depending on apt only for apt_repository and apt_preference

[tas50]

What category of cop is this?:

Please try to select as few as possible.

• [ ] Deprecation - A cop that alerts to a deprecation in the Chef Infra Client
• [ ] Correctness - A cop that alerts when incorrect coding behavior is being used
• [ ] Sharing - A cop that alerts to missing functionality necessary for sharing cookboooks with others
• [ ] Style - A cop that alerts to a style best practice
• [ ] Simplification - A cop that alerts to ways code can be simplified through refactoring
• [ ] Effortless - A cop that alerts on code that must be resolved to move to the Effortless pattern
• [ ] Policyfiles - A cop that alerts on code that must be resolved to move to the Policyfiles pattern

Describe the new cop:

If a cookbook depends on apt for the resources that are now built into Chef we should alert.

What it would trigger on:

depends          "apt"