cli/command: remove deprecated NotaryClient from CLI interface

This method is a shallow wrapper around trust.GetNotaryRepository, but
due to its signature resulted in the trust package, and notary dependencies
to become a dependency of the CLI. Consequence of this was that cli-plugins,
which need the cli/command package, would also get notary and its
dependencies as a dependency. It is no longer used, and was deprecated
in 9bc16bbde0.

This patch removes the NotaryClient method from the interface

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

cli/command/cli.go

@@ -56,7 +56,6 @@ type Cli interface {
 	CurrentContext() string
 	DockerEndpoint() docker.Endpoint
 	TelemetryClient
-	DeprecatedNotaryClient
 	DeprecatedManifestClient
 }