Werk #1792: Fix path to special agents in case of manual installation

Component	Core & setup
Title	Fix path to special agents in case of manual installation
Date	Dec 19, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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