Separate remote and local commands

In the previous CLI, we had an accurate depiction of commands
available for the remote client and those available for the
local client.

Signed-off-by: baude <bbaude@redhat.com>

cmd/podman/diff.go

@@ -59,9 +59,8 @@ func init() {
 
 	flags.MarkHidden("archive")
 
-	rootCmd.AddCommand(diffCommand.Command)
-
 }
+
 func formatJSON(output []diffOutputParams) (diffJSONOutput, error) {
 	jsonStruct := diffJSONOutput{}
 	for _, output := range output {