getdeps: ask testpilot to re-run failed tests up to 3 times
getdeps: ask testpilot to re-run failed tests up to 3 times

Summary: This helps to squash out some flakiness

Reviewed By: pkaush

Differential Revision: D17804696

fbshipit-source-id: decd8e5dd37d802c62cae1168c4f4d72c0fc5c83

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly