flag: recognize "0s" as the zero value for a flag.Duration
Implemented by using a reflect-based approach to recognize the zero value of any non-interface type that implements flag.Value. Interface types will fall back to the old code. Fixes #15904. Change-Id: I594c3bfb30e9ab1aca3e008ef7f70be20aa41a0b Reviewed-on: https://go-review.googlesource.com/23581 Run-TryBot: Ian Lance Taylor <iant@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Rob Pike <r@golang.org>
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