Fixing a few bugs/issues

[jpricket]

1. Ensuring that there is only one TFVC repository being used.
2. Optimizing the content provider not to try and get server content for local only files.
3. Making sure there is only one TFVC output channel created.

[msftclas]

Hi @jpricketMSFT, I'm your friendly neighborhood Microsoft Pull Request Bot (You can call me MSBOT). Thanks for your contribution!

It looks like you're a Microsoft contributor (Jason Prickett). If you're full-time, we DON'T require a Contribution License Agreement. If you are a vendor, please DO sign the electronic Contribution License Agreement. It will take 2 minutes and there's no faxing! https://cla.microsoft.com.

TTYL, MSBOT;

[jeffyoung]

Oh yeah!