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Parse option 39 (Client Fully Qualified Domain Name, RFC 4704) from the DHCP reply, which specifies the FQDN assigned by the server to the client. https://github.com/systemd/systemd/commit/c43eea9f2effbb066901a61eafef473558d37b0f (cherry picked from commit 813fb7d6) (cherry picked from commit 504a3486)