Werk #890: Fix availability computation for hosts

Component	Reporting & availability
Title	Fix availability computation for hosts
Date	May 22, 2014
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The host state "down" was classified as "host_down". This lead to incorrect numbers for host availability.

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