[devserver] update stage_telemetry call.

Removes the call to stage autotest out of the devserver code
and moves it to autotest.

BUG=chromium:438278
TEST=local telemetry run.
CQ-DEPEND=CL:233040
Change-Id: I1f13ed28fa1571bd731ce9ae6684579e5aa055d8
Reviewed-on: https://chromium-review.googlesource.com/233036
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/devserver.py b/devserver.py
index 2ac4b9f..c398c9e 100755
--- a/devserver.py
+++ b/devserver.py
@@ -569,7 +569,6 @@
       Path to the source folder for the telemetry codebase once it is staged.
     """
     archive_url = kwargs.get('archive_url')
-    self.stage(archive_url=archive_url, artifacts='autotest')
 
     build = '/'.join(downloader.Downloader.ParseUrl(archive_url))
     build_path = os.path.join(updater.static_dir, build)