++ exception handling

scripts/uncloud

@@ -8,6 +8,7 @@ import sys
 from logging.handlers import SysLogHandler
 from uncloud.configure.main import configure_parser
 
+from uncloud import UncloudException
 
 def exception_hook(exc_type, exc_value, exc_traceback):
     logging.getLogger(__name__).error(
@@ -61,5 +62,7 @@ if __name__ == '__main__':
             mod = importlib.import_module("uncloud.{}.main".format(name))
             main = getattr(mod, "main")
             main(**arguments)
+        except UncloudException as err:
+            logger.error(err)
         except Exception as err:
             logger.exception(err)