After setting MKEVENTD option in 'omd config' run 'cmk -U' in order
to update the core config.
After disabling MKEVENTD via 'omd config' and 'omd start'
the tactical overview fails while contacting the mkeventd via
the socket tmp/run/mkeventd/status in order to gather information
about open and acknowledged events.
This happened because the core config was not updated via 'cmk -U'.
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