auth.py: Stop printing the command every time

BUG=None
TEST=run_tests

Change-Id: Ic730f059e727cb3a762fd3af295038cc6eeadd94
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/1566963
Reviewed-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
Commit-Queue: Dhanya Ganesh <dhanyaganesh@chromium.org>
Tested-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
diff --git a/lib/auth.py b/lib/auth.py
index 1975260..ad7eaae 100644
--- a/lib/auth.py
+++ b/lib/auth.py
@@ -73,6 +73,7 @@
 
   result = cros_build_lib.RunCommand(
       cmd,
+      print_cmd=False,
       mute_output=True,
       error_code_ok=True)
 
@@ -101,6 +102,7 @@
 
   result = cros_build_lib.RunCommand(
       cmd,
+      print_cmd=False,
       mute_output=True,
       capture_output=True,
       error_code_ok=True)