Decide what to do if a DNS-Server is not reachable
Currently, this is interpreted as "challenge not available" However, some servers might not be able to reach e.g. belwue for various reasons.
We should definitely log "connection timeout/fail" differently from "does not yet have challenge".
Possible solutions:
- Assume challenge deploy success on connection fail to a DNS-Server
- Assume that all DNS-Servers must be reachable and keep it that way
Edited by Dominik Rimpf