Move common storage, plot and statistic code to cephlib
diff --git a/wally/logger.py b/wally/logger.py
index d885ea9..23b0f3b 100644
--- a/wally/logger.py
+++ b/wally/logger.py
@@ -1,7 +1,6 @@
-import yaml
 import logging
 import logging.config
-from typing import Callable, IO, Optional
+from typing import Callable
 
 
 def color_me(color: int) -> Callable[[str], str]: