[copyright] Change to copyright headers without years
[copyright] Change to copyright headers without years

Reviewed By: mbouaziz

Differential Revision: D15772330

fbshipit-source-id: ca2bdca13

facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer