Check_MK Werk 5745: handle deferred notification properly

ID: 5745 Title: handle deferred notification properly Component: Notifications Level: 1 Class: Bug fix Version: 1.5.0i4 After the first retry deferred notification did not respect the cooldown time defined in the global settings anymore. Furthermore the counting of the configured retries was not done properly. If e.g. a retry count of one was specified actually three retries were performed. These two issues have now been fixed.