keep_last_n
- keep_last_n
- added a configuration option that tells the adapter to automatically delete old AutomationRequests and their associated Results and all other artifacts (SUTs, Contributions, ...)
- configured in adapter.properties using "keep_last_n_enabled" (bool) and "keep_last_n" (>0)
- added a test suite for keep_last_n (separate test suite due to requiring different adapter conf)