Do not return found services on dummy0

When registering and advertising a service on the same device, it is
possible for NsdService to find the service on the dummy0 interface. It
is however unusable and not resolveable.

Skip callbacks on the dummy0 interface as they would confuse apps and
tests.

Bug: 266176036
Test: atest NsdServiceTest
Change-Id: I98cca0135e0f6936187d45707cbdad7a7f263ff1
2 files changed