Housekeeper chores

The housekeeper chores task runs only at idle times, and does not use a common configuration parameter.

It manages miscellaneous chores, such as:

Flushing table statistics.
Flushing account statistics.
Handling timeout of detached transactions. You can turn off this task using the configuration parameter dtm detach timeout period.
Checking licence usage. You can turn off this task using the configuration parameter license information.