Fix TSIG bug releated to ID substitution #504
Merged
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TSIG accounts for ID substitution. This means if the ID in the DNS
message is changed by for example a forwarder, TSIG calculation should
use the original message ID (from the TSIG RR).
I have a test for this as well, but it seems tsig_test.go has been
removed, so not sure where to put it now.