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

ID: 13323 Title: Fix validation of host addresses in different situations Component: Setup Level: 1 Class: Bug fix Version: 2.1.0i1 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.