- only send signal if stopping, no need for canceling as pods/containers will be removed
- refactor stop/cancel handling to be unified in manager, separate in job
- when stopping / graceful shutdown, return false if sending signal fails
- return success=true in json response if and only if stop/cancel actually succeeds, return 'error' message in error, should fix#270
- allow canceling after stopping / if stopping fails
- ensure finished time is set in case of cancelation before crawl starts, should fix#273
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