this method expands the registry name as used in the prefix of a repo to a full url.

load up the auth config information and return values FIXME: use the internal golang config parser.

try to register/login to the registry server.

NewService returns a new instance of Service ready to be installed no an engine.

Resolves a repository name to a hostname + name.

save the auth config.

Where we store the config file.

Only used for user auth + account creation.

Service exposes registry capabilities in the standard Engine interface.