Plumb error reporting through (0 on success, non 0 on errors reported)

[johanste]

Also added a couple of basic cmdlet tests for core CLU along with batch file driver.

[azurecla]

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[markcowl]

@johanste Looks like an error with the resources file. Also, merge conflicts

[azurecla]

Hi @johanste, I'm your friendly neighborhood Azure Pull Request Bot (You can call me AZPRBOT). Thanks for your contribution!

It looks like you're working at Microsoft (johanste). If you're full-time, we DON'T require a contribution license agreement.

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