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

Komponente Core & setup
Titel Fix terminating "cmk --update-dns-cache" with CTRL+C
Datum 31.10.2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk-Version 1.6.0p6 2.0.0i1
Level Kleine Änderung
Klasse Bugfix
Kompatibilität Kompatibel - benötigt kein manuelles Eingreifen

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

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