Going forward, Docker won't use a different default registry on Windows.
This changes Windows to use the standard Docker Hub registry as the
default registry.
There is a plan in place to migrate existing images from the Windows
registry to Hub's normal registry, in advance of the 1.11 release. In
the mean time, images on the Windows registry can be accessed by
prefixing them with `registry-win-tp3.docker.io/`.
Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com>
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