Do not send "buildbot went away" emails to the buildbot-status maling list

[pablogsal]

@ned-deily requested that the "buildbot went away" emails are not sent to the buildbot-status mailing list. Any objections?

CC: @vstinner @zware

[vstinner]

I don't see the point of these emails. Please stop to send them :-)

[zware]

They're supposed to only be sent when a worker suddenly disappears, not every time the master is restarted (and restarts have become rather more frequent of late :)). I've pinged buildbot/buildbot#4234 about it, but if there's no change then we might as well disable them to the list:

buildmaster-config/master/custom/workers.py

Line 31 in f4ae6ba

map(str, filter(None, (settings.get("status_email", None), owner_email)))

Removing settings.get("status_email", None) here would do it.