docker info: don't print "registry" (IndexServerAddress) #4204
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The IndexServerAddress field was as part of the initial Windows implementation of the engine. For legal reasons, Microsoft Windows (and thus Docker images based on Windows) were not allowed to be distributed through non-Microsoft infrastructure. As a temporary solution, a dedicated "registry-win-tp3.docker.io" registry was created to serve Windows images.
Currently, this field always shows "https://index.docker.io/v1/", which is confusing, because that address is not used for the registry (only for authentication and "v1" search).
Starting with b4ca1c7, this field is also no longer used during authentication, and a3d56e7 removed the (deprecated) ElectAuthServer() which was previously used to query it.
Given that there's currently no practical use for this information, and it only adds "noise" (and confusion), this patch removes it from the default output.
For now, the field is (still) available for those that want to use it;
But it won't be printed by default.
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