Disable telemetry_on_dut by default

telemetry_on_dut is buggy on devserver.

BUG=chromium:598122
TEST=test_that --board=squawks [dut] telemetry_Benchmarks.* \
     --args=" local=True telemetry_on_dut=[|True|False] "

Change-Id: If09e8aa1e4f1d0c7a282ffc1075ff5c7930372a9
Reviewed-on: https://chromium-review.googlesource.com/335385
Tested-by: Ting-Yuan Huang <laszio@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
Commit-Queue: Luis Lozano <llozano@chromium.org>
diff --git a/server/cros/telemetry_runner.py b/server/cros/telemetry_runner.py
index 16ef4bf..b49f802 100644
--- a/server/cros/telemetry_runner.py
+++ b/server/cros/telemetry_runner.py
@@ -84,7 +84,7 @@
     output to the caller.
     """
 
-    def __init__(self, host, local=False, telemetry_on_dut=True):
+    def __init__(self, host, local=False, telemetry_on_dut=False):
         """Initializes this telemetry runner instance.
 
         If telemetry is not installed for this build, it will be.