Werk #444: timemachine: do not inventorize check when timemachine is not used

Component	Checks & agents
Title	timemachine: do not inventorize check when timemachine is not used
Date	Jan 9, 2014
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)

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