Werk #7838: oracle_instance: Fixed conversion of DB creation time

Component	HW/SW inventory
Title	oracle_instance: Fixed conversion of DB creation time
Date	Jun 19, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0p19 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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