two side pinging for runners

[Konard]

If runner not using in some time - it kills itself - timeout for selfkilling, which is renewed every time it get call
If runner not sended ping for some time - try to kill and remove from cash. interval in links checks last ping time + route for pinging
interval which kills stopped containers

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Forked from deep-foundation/deeplinks#54 by https://github.com/konard/gh-org-migrator