Fix lint errors to enable stricter PyLint rules

webrtc/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment_gencfgs.py

 #!/usr/bin/env python
 # Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 """Generate .json files with which the APM module can be tested using the
@@ skipping 43 matching lines @@
         config_filename))
     logging.debug('config file <%s> | %s', config_filepath, config)
 
     data_access.AudioProcConfigFile.Save(config_filepath, config)
     logging.info('config file created: <%s>', config_filepath)
 
 
 def _GenerateAllDefaultButOne():
   """Disables the flags enabled by default one-by-one.
   """
-  CONFIG_SETS = {
+  config_sets = {
       'no_AEC': {'-aec': 0,},
       'no_AGC': {'-agc': 0,},
       'no_HP_filter': {'-hpf': 0,},
       'no_level_estimator': {'-le': 0,},
       'no_noise_suppressor': {'-ns': 0,},
       'no_transient_suppressor': {'-ts': 0,},
       'no_vad': {'-vad': 0,},
   }
-  _GenerateDefaultOverridden(CONFIG_SETS)
+  _GenerateDefaultOverridden(config_sets)
 
 
 def _GenerateAllDefaultPlusOne():
   """Enables the flags disabled by default one-by-one.
   """
-  CONFIG_SETS = {
+  config_sets = {
       'with_AECM': {'-aec': 0, '-aecm': 1,},  # AEC and AECM are exclusive.
       'with_AGC_limiter': {'-agc_limiter': 1,},
       'with_AEC_delay_agnostic': {'-delay_agnostic': 1,},
       'with_drift_compensation': {'-drift_compensation': 1,},
       'with_residual_echo_detector': {'-ed': 1,},
       'with_AEC_extended_filter': {'-extended_filter': 1,},
       'with_intelligibility_enhancer': {'-ie': 1,},
       'with_LC': {'-lc': 1,},
       'with_refined_adaptive_filter': {'-refined_adaptive_filter': 1,},
   }
-  _GenerateDefaultOverridden(CONFIG_SETS)
+  _GenerateDefaultOverridden(config_sets)
 
 
 def main():
   logging.basicConfig(level=logging.INFO)
   _GenerateAllDefaultPlusOne()
   _GenerateAllDefaultButOne()
 
 
 if __name__ == '__main__':
   main()