Werk #12296: Fix IPv6 handling in dual stack

Component	Checks & agents
Title	Fix IPv6 handling in dual stack
Date	Mar 2, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Selecting IPv6 as the default of a dual stack configuration would break the communication with the host with the following error: "Communication failed: [Errno -9] Address family for hostname not supported".

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