net: deflake listener tests
This change makes TestDualStack{TCP,UDP}Listener work more properly by
attempting to book an available service port before testing.
Also simplifies error messages in tests.
Fixes #5001.
Change-Id: If13b0d0039878c9bd32061a0440664e4fa7abaf7
Reviewed-on: https://go-review.googlesource.com/9661
Reviewed-by:
Ian Lance Taylor <iant@golang.org>
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