Werk #13323: Fix validation of host addresses in different situations

There are different situations where host addresses can be configured within the Checkmk setup (e.g. Additional IP addresses, host diagnostic, management address). In some of them host names, IPv4 and IPv6 addresses are allowed and in some of them only a subset. Depending on the situation, the validation should be as specific as possible, but the inserted value was not correctly validated in all the situations.

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