veyron/examples/tunnel/tunneld: Add more logging to help debug flaky test failures.
veyron/examples/tunnel/tunneld: Add more logging to help debug flaky
test failures.

Change-Id: I93d08298ba3062b712bea91ea90dd2ac61788e95

vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref,vanadium/go.ref