Werk #3091: fixed failure to rename hosts in raw edition

Component	Setup
Title	fixed failure to rename hosts in raw edition
Date	Mar 8, 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) 1.2.8b5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

renaming of hosts would cancel with the error "No such file or directory: '/omd/sites/sitename/var/check_mk/agents/'"

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