[Python-buildbots] Disable notifiations on broken workers

Hi,

I propose to disable email and IRC notifications on workers which were never green (tests always failed): https://github.com/python/buildmaster-config/pull/86

• Alpine Linux
• Cygwin
• "AMD64 Clang UBSan 3." (3.6, 3.7 and 3.x, surprisingly, 2.7 is green)

Does anyone have a good reason to keep notifications for these workers?

I proposed this change because the Cygwin sent 2 emails in 2 days, whereas this worker is failing since it has been registered.

Victor

Night gathers, and now my watch begins. It shall not end until my death.