Werk #2843: Hanging notification scripts could prevent all other notifications

Notification scripts are assumed to finish within short time like a couple of seconds. If a notification script takes longer or is hanging for ever, it prevent Check_MK from sending out other notifications. So one hanging notification could prevent all others.

This has been fixed by introducing a global notification plugin timeout. All notification plugins which take more than 60 seconds will be killed so that other notifications can be done again. If you need a different timeout, you can configure it using the global setting "Notification plugin timeout".

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