[mdns] ensure callback is invoked when registering host with no address #10264
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This commit updates the native mDNS implementation to ensure the callback is invoked when a host is registered without any address (effectively unregistering the host and removing any previously registered addresses for the host-name).
The implementation ensures the callback is invoked after returning from the
RegisterHost()
call (invoked from a posted tasklet), as required by the mDNS API definitions.Additionally, the
test_mdns
unit test is updated to cover registering a host with no address for the first time or updating a previous registration.Fixes #10262