config: added debug output of complete configuration

It might be useful to see the merged configuration in case of debugging.
This patch adds it to the debug output log level.

Signed-off-by: Claudius Heine <ch@denx.de>

kas/config.py

@@ -25,6 +25,7 @@
 
 import os
 import logging
+import pprint
 
 try:
     from distro import id as get_distro_id
@@ -88,6 +89,9 @@ class Config:
             (self._config, missing_repo_names) = \
                 self.handler.get_config(repos=repo_paths)
 
+        logging.debug('Configuration from config file:\n%s',
+                      pprint.pformat(self._config))
+
         if target:
             self._config['target'] = target
         if task: