Report: add send_at_exit method

Report.py

@@ -3,6 +3,7 @@
 
 """ Report """
 
+import atexit
 import logging
 
 
@@ -56,3 +57,7 @@ class Report(object):  # pylint: disable=useless-object-inheritance
             text_body=content
         )
         return email_client.send(self.rcpt_to or rcpt_to, msg=msg, just_try=just_try)
+
+    def send_at_exit(self, **kwargs):
+        """ Send report at exit """
+        atexit.register(self.send, **kwargs)