Werk #3587: SNMP: Fixed possible random IO issues when using classic SNMP

Component	Checks & agents
Title	SNMP: Fixed possible random IO issues when using classic SNMP
Date	Jun 2, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The file descriptors of Check_MK were not properly closed when launching the SNMP subprocesses.

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