Add debug log entry at beginning of action

Change-Id: I920a5f9f7d090b95350e88e539dd72292b029fee
diff --git a/container/tools/actions/abstract.py b/container/tools/actions/abstract.py
index 820908a..70d1694 100644
--- a/container/tools/actions/abstract.py
+++ b/container/tools/actions/abstract.py
@@ -32,6 +32,8 @@
 
     def execute(self):
         if self._is_executed():
+            self.log.debug("Executing %s", self.__class__.__name__)
+
             try:
                 return self._execute_action()
             except Exception: