Fix dnstap relaying "random" messages instead of resolver/forwarder responses

Unbound
1

This was already fixed for serviced_tcp_callback() in revision 3390, but
for some reason serviced_udp_callback() left untouched.

Index: services/outside_network.c

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Hi Nikolay,

Thank you for the fix, it is integrated (but did not make into the just
release 1.5.10 release).

Best regards, Wouter