Werk #6283: New mode "omd cleanup" for removing unused Check_MK versions

Component	Site management
Title	New mode "omd cleanup" for removing unused Check_MK versions
Date	Jul 2, 2018
Level	Prominent Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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