Werk #6369: Fixed date shown for the first inventory history entry

Component	HW/SW inventory
Title	Fixed date shown for the first inventory history entry
Date	Jul 26, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.5.0b10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Instead of showing 01.01.1970 for the first inventory history entry the view now shows the correct inventory time again. This regression affects all previous 1.5 releases

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