Check In Code Generation Files to Allow for Vendoring

[samkreter]

Is this a request for help?: No

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Is this an ISSUE or FEATURE REQUEST? (choose one): ISSUE

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What version of aks-engine?: Latest code in the repo

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Kubernetes version: NA

What happened: When vendoring aks-engine using dep or another dependency management tool, it is required to run "go generate" to have to code compile correctly.

What you expected to happen: Ideally, the generated code is already checked into the repo allowing to directly vendor it into other applications.