Address code review comments

Author: marekaiv

samtranslator/plugins/application/serverless_app_plugin.py

@@ -316,6 +316,8 @@ def on_after_transform_template(self, template):
             while (time() - start_time) < self.TEMPLATE_WAIT_TIMEOUT_SECONDS:
                 temp = self._in_progress_templates
                 self._in_progress_templates = []
+                # it's either our first time in this loop or we just slept SLEEP_TIME_SECONDS so we can
+                # try calling SAR
                 throttled = False
 
                 # Check each resource to make sure it's active

tests/plugins/application/test_serverless_app_plugin.py

@@ -257,9 +257,6 @@ def __init__(self, app_id="app_id", semver="1.3.5"):
 
 
 class TestServerlessAppPlugin_on_after_transform_template(TestCase):
-    def setUp(self):
-        pass
-
     def test_sar_throttling_doesnt_stop_processing(self):
         client = Mock()
         client.get_cloud_formation_template = Mock()