[tools/perf] Disable output format on benchmark_smoke_unittest & system_health_smoke_test

tools/perf/benchmarks/system_health_smoke_test.py

Index: tools/perf/benchmarks/system_health_smoke_test.py
diff --git a/tools/perf/benchmarks/system_health_smoke_test.py b/tools/perf/benchmarks/system_health_smoke_test.py
index bc22e9a2d0685a307db9bc75684e5abcfc376405..c5e674f67f9dbaf4b9f5f881bea8e76fb208276b 100644
--- a/tools/perf/benchmarks/system_health_smoke_test.py
+++ b/tools/perf/benchmarks/system_health_smoke_test.py
@@ -112,7 +112,7 @@ def _GenerateSmokeTestCase(benchmark_class, story_to_smoke_test):
 def GenerateBenchmarkOptions(benchmark_class):
   # Set the benchmark's default arguments.
   options = options_for_unittests.GetCopy()
-  options.output_format = 'none'
+  options.output_formats = ['none']
   parser = options.CreateParser()
 
   # TODO(nednguyen): probably this logic of setting up the benchmark options