Dev Patel clearly knew the comparisons to “John Wick” would be inescapable. Thus, “Monkey Man,” his violent tale of a young man hell-bent on vengeance — inspired as much as anything, Patel says, by Korean action cinema — wisely namedrops the hit action flick starring Keanu Reeves that, to date, has spawned three sequels and a spin-off series. Heck, there’s even a cute dog.