dns/dnsmessage: allow name compression for SRV resource parsing

[mateusz834]

As per RFC 3597:

Receiving servers MUST decompress domain names in RRs of well-known
type, and SHOULD also decompress RRs of type RP, AFSDB, RT, SIG, PX,
NXT, NAPTR, and SRV (although the current specification of the SRV RR
in RFC2782 prohibits compression, RFC2052 mandated it, and some
servers following that earlier specification are still in use).

This change allows SRV resource decompression.

Updates golang/go#36718
Updates golang/go#37362

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Message from Damien Neil:

Patch Set 2: Code-Review+2 Run-TryBot+1

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Patch Set 2: Code-Review+1

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This PR is being closed because golang.org/cl/540375 has been merged.