Reduce test flakiness when starting Watchman
Reduce test flakiness when starting Watchman

Summary:
On machines with high load (e.g. when stress-testing), Watchman tests frequently fail due to a timeout in WatchmanInstance.start. A timeout of 5 seconds is pretty low, especially with unoptimized builds with sanitizers enabled.

Make tests less flaky by increasing the timeout.

Reviewed By: simpkins

Differential Revision: D14294193

fbshipit-source-id: 2e94ad719500025252a5fa45626cf43169a4745c

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