[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>
3 files changed