Implements the functionality to customize the logging based on config…

… file (amundsen-io#95)

* Adds the option to have logging using configuration file

* Bumps the version of metadata since we need this for monitoring

* Disables the existing loggers in case of config file

metadata_service/__init__.py

@@ -60,7 +60,7 @@ def create_app(*, config_module_class: str) -> Flask:
     app.config.from_object(config_module_class)
 
     if app.config.get('LOG_CONFIG_FILE'):
-        logging.config.fileConfig(app.config.get('LOG_CONFIG_FILE'))
+        logging.config.fileConfig(app.config.get('LOG_CONFIG_FILE'), disable_existing_loggers=False)
     else:
         logging.basicConfig(format=app.config.get('LOG_FORMAT'), datefmt=app.config.get('LOG_DATE_FORMAT'))
         logging.getLogger().setLevel(app.config.get('LOG_LEVEL'))