Add ctr exec

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

linux/shim/process.go

@@ -15,7 +15,7 @@ type process interface {
 	Exited(status int)
 	// Status returns the exit status
 	Status() int
-	// Delete delets the process and its resourcess
+	// Delete deletes the process and its resourcess
 	Delete(context.Context) error
 	// Signal directly signals the process
 	Signal(int) error