Fix system tests failure

The latest changes to the logger caused the CI tests to fail,
because test assumes that the logging.conf file is present in the
same directory as the sample application script.
The sample application used cwd() instead, and did not find the
log configuration file.

apputils/execution_env.py

@@ -91,11 +91,12 @@ def config_pylogger(log_cfg_file, experiment_name):
     """
     timestr = time.strftime("%Y.%m.%d-%H%M%S")
     filename = timestr if experiment_name is None else experiment_name + '___' + timestr
-    logdir = './logs' + '/' + filename
+    logdir =  os.path.join('./logs', filename)
     if not os.path.exists(logdir):
         os.makedirs(logdir)
     log_filename = os.path.join(logdir, filename + '.log')
-    logging.config.fileConfig(os.path.join(os.getcwd(), log_cfg_file), defaults={'logfilename': log_filename})
+    if os.path.isfile(log_cfg_file):
+        logging.config.fileConfig(log_cfg_file, defaults={'logfilename': log_filename})
     msglogger = logging.getLogger()
     msglogger.logdir = logdir
     msglogger.log_filename = log_filename

examples/classifier_compression/compress_classifier.py

@@ -146,7 +146,7 @@ def main():
     global msglogger
     check_pytorch_version()
     args = parser.parse_args()
-    msglogger = apputils.config_pylogger('logging.conf', args.name)
+    msglogger = apputils.config_pylogger(os.path.join(script_dir, 'logging.conf'), args.name)
 
     # Log various details about the execution environment.  It is sometimes useful
     # to refer to past experiment executions and this information may be useful.