Werk #11899: Add DAT date detection to McAfee ENS DAT dates

Component	Checks & agents
Title	Add DAT date detection to McAfee ENS DAT dates
Date	Dec 21, 2020
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

This adds detection of McAfee ENS DAT dates and returns the DAT date in the format of Virusscan dates.

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