Pick up per-repository auth changes from go-containerregistry

[imjasonh]

Fixes #687

This picks up changes to auth config processing so that you can use a different username+password to auth to different repositories in the same registry, e.g.:

{
    "auths": {
        "example.com/registryA": { // Pull
            "username": "userA",
            "password": "passA"
        },
        "example.com/registryB": { // Push
            "username": "userB",
            "password": "passB"
        }
    }
}

This also picks up some log spam fixes when Google auth is not configured and not used.

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Release Notes

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Accept per-repository auth configured in ~/.docker/config.json, in addition to per-registry auth