Add support to quarantine a Bot, including an automatic health check

[GoogleCodeExporter]

Repro:
1. Run jobs on a specific bot and tasks always fails.

Expected:
The bot stops taking tasks and the admins are alerted.

Actual:
Bot continues to kill tasks repeatedly. It's going to use signal like bug 114.

The idea is to put the bot in Quarantine mode where it just hangs in there 
until someone fixes it.

Original issue reported on code.google.com by maruel@chromium.org on 12 Jun 2014 at 9:02

• Blocking: #123
• Blocked on: #114, #117

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Original comment by maruel@chromium.org on 12 Jun 2014 at 9:03

• Added labels: Priority-0
• Removed labels: Priority-2

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Original comment by maruel@chromium.org on 16 Jun 2014 at 6:01

• Now blocked on: #117

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Original comment by maruel@chromium.org on 17 Jun 2014 at 2:38

• Now blocking: #123

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I think the health check should be provided by start_slave.py.

Original comment by maruel@chromium.org on 17 Jun 2014 at 5:15

• Changed title: Add support to quarantine a Bot, including an automatic health check

[GoogleCodeExporter]

Original comment by maruel@chromium.org on 17 Jun 2014 at 5:15

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Backend support added in b37d3079db45346f93098b115dd2babc5c9366c7. No API nor 
frontend yet.

Original comment by maruel@chromium.org on 23 Jul 2014 at 1:30

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It's important but I have too many things going on at the moment to work on it 
right now.

Original comment by maruel@chromium.org on 17 Sep 2014 at 6:54

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Lowering priority

Original comment by maruel@chromium.org on 30 Sep 2014 at 5:27

• Added labels: Priority-1
• Removed labels: Priority-0

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Issue 114 has been merged into this issue.

Original comment by maruel@chromium.org on 13 Nov 2014 at 1:23

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This was implemented. The UI is described in issue 123.

Original comment by maruel@chromium.org on 2 Dec 2014 at 7:51