protection against corrupt O2DPG repository during topology generation

[ehellbar]

I tested this locally both from scratch and with a corrupt repository from one of the topology generations today.

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[ehellbar]

@davidrohr I updated the commit as we discussed

1. reset to HEAD from the start
2. clean untracked files

[davidrohr]

Thanks, looks good!
Have you tested it on the corrupted repository that you have saved?

[ehellbar]

Yes, it works as expected

[davidrohr]

great, then let's get it merged, and let's ask RC to deploy with the next SW update, since we had 2 such failures already.