- The `Version` field was not used for any purpose, other than a debug log
- The `X-Docker-Registry-Version` header was part of the registry v1 spec,
however, as we're not using the `Version` field, we don't need the
header for anything.
- The `X-Docker-Registry-Config` header was only set by the mock registry;
there's no code consuming it, so we don't need to mock it (even if an
actual v1 registry / search API would return it).
It's also worth noting that we never call the `_ping` endpoint when using
Docker Hub's search API, and Docker Hub does not even implement the `_ping`
endpoint;
curl -fsSL https://index.docker.io/_ping | head -n 4
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<title>Docker</title>
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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