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Rollback setting IP_DONTFRAG option on the UDP sockets

Ondřej Surý requested to merge 2487-rollback-setting-dontfrag-option into main

In DNS Flag Day 2020, the development branch started setting the IP_DONTFRAG option on the UDP sockets. It turned out, that this code was incomplete leading to dropping the outgoing UDP packets. Henceforth this commit rolls back this setting until we have a proper fix that would send back empty response with TC flag set.

Closes #2487 (closed) #2466 (closed)

Edited by Ondřej Surý

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