Previously resolve queries for SRV/TXT/A/AAAA were only sent when there
was a known but incomplete MdnsResponse for the service.
Allow sending the resolve queries when there is no known MdnsResponse,
so no known PTR record, but the client specified the resolveInstanceName
in the MdnsSearchOptions. This is achieved by adding the serviceName as
an additional field in MdnsResponse, as it is always known when
constructing the MdnsResponse. The serviceName can either be set from a
discovered PTR record, or from the client-specified resolveInstanceName.
Bug: 267570781
Test: atest NsdManagerTest#testResolveWhenServerSendsNoAdditionalRecord
(see separate change).
Change-Id: Icb9ed7ae44179a5df5b69a1e6a0486ffc2d8e42c
448100884e