Werk #8325: fixed leaking of file handles in alert handler

Component	The Checkmk Micro Core
Title	fixed leaking of file handles in alert handler
Date	Mar 2, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Pro, Checkmk Ultimate MT

Previously the alert handler leaked one filedescriptor (a pipe) for each alert sent.

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