Migrate pull command to cobra

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

cobraadaptor/adaptor.go

@@ -59,6 +59,7 @@ func NewCobraAdaptor(clientFlags *cliflags.ClientFlags) CobraAdaptor {
 		image.NewLoadCommand(dockerCli),
 		image.NewRemoveCommand(dockerCli),
 		image.NewSaveCommand(dockerCli),
+		image.NewPullCommand(dockerCli),
 		image.NewSearchCommand(dockerCli),
 		image.NewImportCommand(dockerCli),
 		image.NewTagCommand(dockerCli),

usage.go

@@ -16,7 +16,6 @@ var DockerCommandUsage = []Command{
 	{"login", "Log in to a Docker registry"},
 	{"logout", "Log out from a Docker registry"},
 	{"ps", "List containers"},
-	{"pull", "Pull an image or a repository from a registry"},
 	{"push", "Push an image or a repository to a registry"},
 	{"update", "Update configuration of one or more containers"},
 }