Werk #2217: md: Fix handling of found and expected disks

Component	Checks & agents
Title	md: Fix handling of found and expected disks
Date	Jun 8, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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