Werk #1040: Avoid sporadic errors when checking event state in Event Console

When you add the check for checking the current event state of a host in the Event Console than under heavy load it could sometimes happen that the check would run into an error (Ressource temporarily unavailable). This has been fixed by switching from the Python version of check_mkevents to the C version. This also saves CPU ressources if you have a larger number of hosts.

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