Werk #8364: Make sure the monitoring core doesn't hang when trying to send pings.

Component	Core & setup
Title	Make sure the monitoring core doesn't hang when trying to send pings.
Date	Dec 1, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Pro, Checkmk Ultimate MT

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