[infra] Increase post-ASAN-setup sleep time. Pixels are still failing after ASAN setup, e.g.: https://chromium-swarm.appspot.com/task?id=42b050e90e06a210 https://chromium-swarm.appspot.com/task?id=42b054a2d05dec10 Change-Id: Ife04b894ad01de69fa4639e97eba578f058cad0c Reviewed-on: https://skia-review.googlesource.com/c/187788 Auto-Submit: Ben Wagner <benjaminwagner@google.com> Commit-Queue: Kevin Lubick <kjlubick@google.com> Reviewed-by: Kevin Lubick <kjlubick@google.com>