satosa.base: log state on debug level

State of satosa can contain some encoded data (cookies_samesite_compat)
which are to verbose on info level. Therefore The "Loaded state ..." log
message is emitted on debug level.

Author: Nyiro Gergo

src/satosa/base.py

@@ -207,7 +207,7 @@ def _load_state(self, context):
             context.state = state
             msg = "Loaded state {state} from cookie {cookie}".format(state=state, cookie=context.cookie)
             logline = lu.LOG_FMT.format(id=lu.get_session_id(context.state), message=msg)
-            logger.info(logline)
+            logger.debug(logline)
 
     def _save_state(self, resp, context):
         """