completion v2: some small follow-ups

- Prevent completion on "create" subcommands to prevent them
  from completing with local filenames
- Add completion for "docker image save"
- Add completion for "docker image tag"
- Disable completion for "docker login"
- Exclude "paused" containers for "docker container attach" and
  "docker container exec"

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

cli/command/container/attach.go

@@ -55,7 +55,9 @@ func NewAttachCommand(dockerCli command.Cli) *cobra.Command {
 			opts.container = args[0]
 			return runAttach(dockerCli, &opts)
 		},
-		ValidArgsFunction: completion.ContainerNames(dockerCli, false),
+		ValidArgsFunction: completion.ContainerNames(dockerCli, false, func(container types.Container) bool {
+			return container.State != "paused"
+		}),
 	}
 
 	flags := cmd.Flags()