Set default log_file

Change-Id: I912e6c84f1a9d43a457be6bbf2e420de0cc62e61

octane/app.py

@@ -34,6 +34,11 @@ class OctaneApp(app.App):
             description, version, argparse_kwargs)
         if os.environ.get('OCTANE_DEBUG'):
             parser.set_defaults(debug=True, verbose_level=2)
+        if os.getuid() == 0:  # Fuel master anarchy
+            log_file = '/var/log/octane.log'
+        else:  # Probably local dev's env
+            log_file = 'octane.log'
+        parser.set_defaults(log_file=log_file)
         return parser
 
     def configure_logging(self):

octane/log.py

@@ -37,7 +37,7 @@ def set_console_formatter(**formatter_kwargs):
     formatter_kwargs.setdefault('datefmt', '%Y-%m-%d %H:%M:%S')
     root_logger = logging.getLogger('')
     for handler in root_logger.handlers:
-        if isinstance(handler, logging.StreamHandler):
+        if handler.__class__ is logging.StreamHandler:  # Skip subclasses
             console_handler = handler
             break
     else: