fix failing build on hosts with wildcard dns (fixes #1230) #1278
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Replaces #1231
on hosts which have wildcard dns domains in their local domain search list, builds failed because "nosuch.host" could actually be resolved.
Since ".host" isn't a recommended TLD by RFC2606, we use ".invalid" now. And since this is not enough to fix the problem, we use now absoulte domain names (having a '.' at the end)
Fixes #1230
Requirements
All new code should be covered with tests, documentation should be updated. CI should pass.
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