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Disable the PMTUD also on the old socket UDP code

Ondřej Surý requested to merge 2183-enable-DF-on-old-socket-code-v9_16 into v9_16

Instead of just disabling the PMTUD mechanism on the UDP sockets, we now set IP_DONTFRAG (IPV6_DONTFRAG) flag. That means that the UDP packets won't get ever fragmented. If the ICMP packets are lost the UDP will just timeout and eventually be retried over TCP.

Closes #2183 (closed)

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