Werk #10377: Fix terminating "cmk --update-dns-cache" with CTRL+C

Component Core & setup
Title Fix terminating "cmk --update-dns-cache" with CTRL+C
Date Oct 31, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0p6 2.0.0i1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Previously the CTRL+C termination was not working during the whole execution time of the call.

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