In a sense, the weirdest thing about “Gimme Danger” is how not weird it is. Its subject, James Osterberg, also known as Iggy Pop, also known as Iggy Stooge, is not just a rock and roll survivor (so to speak) of the first stripe. He’s also, like it or not, one of the maverick eccentrics of the form and the lively arts in general. He’s a rock classic, but if your idea of Classic Rock is Boston, he’s also a major weirdo. Similarly, Jim Jarmusch, the director of this documentary, is a filmmaker whose work is arguably not inaccessible but whose aesthetic lies pretty far outside of what we know as the mainstream. “Gimme Danger” is by far the most conventional film he’s ever made. I think that’s a very purposeful feature of the film.