fix flaky test by increasing time-out
fix flaky test by increasing time-out

Summary:
The test fails at start-up while waiting to get notification of a cookie file
notificaiton from watchman. It rarely happens and I suspect increasing the
time-out will eliminate the problem.

Reviewed By: wez

Differential Revision: D6714264

fbshipit-source-id: 40e0582618cc79f1b98bc1ae1707c8245e2fc2d7

nodakai/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,wez/watchman,wez/watchman,facebook/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,wez/watchman,nodakai/watchman,facebook/watchman,wez/watchman,nodakai/watchman,wez/watchman,wez/watchman,wez/watchman,facebook/watchman,facebook/watchman,facebook/watchman,nodakai/watchman,wez/watchman,wez/watchman,nodakai/watchman