[autotest] stage autotest_packages when running telemetry tests.

Moves the staging of autotest_packages for telemetry from the
devserver to autotest. Here if staging autotest_packages fails, it
will try to stage autotest instead.

BUG=chromium:438278
TEST=local setup with telemetry run.
CQ-DEPEND=CL:233036

Change-Id: Ib469644ac41762b7edc41a9d1a225d63398018b8
Reviewed-on: https://chromium-review.googlesource.com/233040
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Simran Basi <sbasi@chromium.org>
Tested-by: Simran Basi <sbasi@chromium.org>
diff --git a/server/cros/telemetry_runner.py b/server/cros/telemetry_runner.py
index 2a5cb02..747a2a3 100644
--- a/server/cros/telemetry_runner.py
+++ b/server/cros/telemetry_runner.py
@@ -238,6 +238,7 @@
         logging.debug('Setting up telemetry for build: %s', build)
 
         self._devserver = dev_server.ImageServer.resolve(build)
+        self._devserver.stage_artifacts(build, ['autotest_packages'])
         self._telemetry_path = self._devserver.setup_telemetry(build=build)