Werk #104: mssql: Server instances with underline in name are now supported.

Component	Checks & agents
Title	mssql: Server instances with underline in name are now supported.
Date	Dec 9, 2013
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.5i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Thanks to a patch from H.Schniggendiller

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