Title: Fixed broken cluster checks when using Nagios core
Level: 2
Component: core
Class: fix
Compatible: compat
State: unknown
Version: 1.2.8b1
Date: 1449646012

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
