[infer][tests] Print a message when all tests are passing
[infer][tests] Print a message when all tests are passing

Summary: This message should be printed in the standard output once all the tests have passed which makes it easier to dinstinguish the cases when some tests fail from the cases where all tests are fine.

Reviewed By: sblackshear

Differential Revision: D4150022

fbshipit-source-id: 6be39c2

jvillard/infer,blzq/infer,facebook/infer,jsachs/infer,jvillard/infer,jvillard/infer,kageiit/infer,kageiit/infer,ropas/infer,facebook/infer,blzq/infer,jsachs/infer,facebook/infer,kageiit/infer,blzq/infer,kageiit/infer,blzq/infer,xennygrimmato/infer,ryoon/infer,ryoon/infer,ryoon/infer,xennygrimmato/infer,xennygrimmato/infer,kageiit/infer,facebook/infer,jsachs/infer,facebook/infer,ropas/infer,facebook/infer,blzq/infer,ryoon/infer,ropas/infer,xennygrimmato/infer,facebook/infer,jvillard/infer,jsachs/infer,jsachs/infer,jvillard/infer,ryoon/infer,kageiit/infer,blzq/infer,jvillard/infer,ropas/infer,jvillard/infer,ropas/infer,ryoon/infer,ropas/infer,xennygrimmato/infer,xennygrimmato/infer,kageiit/infer,jsachs/infer,xennygrimmato/infer