The CLI.RegistryClient method is a shallow wrapper around registryclient.NewRegistryClient
but due to its signature resulted in various dependencies becoming a dependency
of the "command" package. Consequence of this was that cli-plugins, which
need the cli/command package, would also get those dependencies.
This patch inlines the code where needed, skipping the wrapper
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>