scan through list of BuildBot workers, check if owner information is available

[ChristianKuehnel]

Once we have the basic documentation in https://github.com/ChristianKuehnel/iwg-workspace/issues/37, scan through the list of workers to make sure that each of them really has an owner that can be contacted. Where that is missing, try to find the owner and ask them to update this information.

Migrated from https://github.com/ChristianKuehnel/iwg-workspace/issues/38

[ChristianKuehnel]

Proposal from meeting on 2021-03-09:

• add policy to provide admin information when providing new worker,
• define admin information in the worker config file in the llvm-zorg repository.

[tstellar]

I think we should review the buildbots and remove broken builders at some regular interval (e.g. once per month). We could have a recurring agenda item on the first meeting of the month to assign someone to do the review.

[ChristianKuehnel]

We could probably automate the scanning as you can get the build results via API. We could also scan for missing/inplausible owner information automatically as well...