plugin options; StpdReader fix

yandextank/plugins/JsonReport/plugin.py

@@ -18,7 +18,7 @@ class Plugin(AbstractPlugin, AggregateResultListener, MonitoringDataListener):
     SECTION = 'json_report'
 
     def get_available_options(self):
-        return []
+        return ['monitoring_log', 'test_data_log', 'test_stats_log']
 
     def configure(self):
         self.monitoring_logger = self.create_file_logger('monitoring',

yandextank/stepper/format.py

@@ -29,9 +29,9 @@ class StpdReader(object):
     def __iter__(self):
         def read_chunk_header(ammo_file):
             chunk_header = ''
-            while chunk_header in '':
+            while not chunk_header:
                 line = ammo_file.readline().decode('utf8')
-                if line in '':
+                if not line:
                     return line  # EOF
                 chunk_header = line.strip('\r\n')
             return chunk_header