Werk #2894: Fixed broken cluster checks when using Nagios core

Component	Core & setup
Title	Fixed broken cluster checks when using Nagios core
Date	Dec 9, 2015
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

When monitoring clustered hosts using Nagios as core, the Check_MK service always resulted in an UNKNOWN state and this exception:

NameError: global name 'set_use_cachefile' is not defined

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