suite_scheduler/sanity: add a control-file-check exemption

BUG=None
TEST=./site_utils/suite_scheduler/suite_scheduler.py --sanity

Change-Id: Iced6d9fa9d9a63d31588f91ce41e5e3ad088e468
Reviewed-on: https://chromium-review.googlesource.com/331750
Trybot-Ready: Aviv Keshet <akeshet@chromium.org>
Tested-by: Aviv Keshet <akeshet@chromium.org>
Reviewed-by: Dan Shi <dshi@google.com>
diff --git a/site_utils/suite_scheduler/sanity.py b/site_utils/suite_scheduler/sanity.py
index 1d944db..644ce49 100644
--- a/site_utils/suite_scheduler/sanity.py
+++ b/site_utils/suite_scheduler/sanity.py
@@ -28,6 +28,8 @@
                                   'test_suites', 'control.'+task.suite)
         if task.suite.startswith('crosbolt_arc_perf'):
             continue
+        if task.suite.startswith('arc-nightly'):
+            continue
         if not os.path.exists(suite_path):
             corrections = True
             logging.warning("No suite control file for %s", task.suite)