Werk #8352: Fix missing service level macro in Check_MK Micro Core

Component	The Checkmk Micro Core
Title	Fix missing service level macro in Check_MK Micro Core
Date	Nov 2, 2015
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Enterprise (CEE), Checkmk MSP (CME)

This was due to the service level being stored as an integer, but in the macros we need strings for string replace.

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