Retry one additional time when fetching local devices for android tests.

Increases total time sleeping from 30s to 62s.

Bug: 892670
Change-Id: Ib4d631da6c24fb3bb2f9f3a9c692ed82d699b397
Reviewed-on: https://chromium-review.googlesource.com/c/1305413
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603559}

build/android/pylib/local/device/local_device_environment.py

@@ -133,7 +133,7 @@ class LocalDeviceEnvironment(environment.Environment):
       device_arg = self._device_serials
 
     self._devices = device_utils.DeviceUtils.HealthyDevices(
-        self._blacklist, retries=4,
+        self._blacklist, retries=5,
         enable_device_files_cache=self._enable_device_cache,
         default_retries=self._max_tries - 1, device_arg=device_arg)