resolv_gold_test: Initial release

The target is that capturing packets from real life network and use them
to do unit test. It makes that unit test could have more testing packets
from real device usage. In the initial release, the DNS responder has
been added the capability for responding predefined packets by a
registered query-response packet mapping.

Test: cd packages/modules/DnsResolver && atest

Change-Id: Ib524e978ba9464d521e72878ae723b573888b38f