The Class field was added because Docker Hub registry required a special
scope to be set for pulling plugins;
HTTP/1.1 401 Unauthorized
...
Www-Authenticate: Bearer realm="https://auth.docker.io/token",service="registry.docker.io",scope="repository(plugin):vieux/sshfs:pull",error="insufficient_scope"
This is no longer a requirement, and the field is no longer set.
updates 0ba820ed0b
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
ed9fcf31e6