Issue 50177 - Add a new CI test case, also added fixes in lib389
    
    Bug Description: Import task should not be deleted too rapidely after import finishes
    to be able to query the status.
    
    Fix Description: A new attribute 'ttl' is order to tune the life time of the task.
    The default value is increased to '86400'. Added a test to check that and added it
    to ImportTask & ExportTask classes in lib389 so it will create ttl attribute by default.
    
    Fixes: https://pagure.io/389-ds-base/issue/50177
    
    Review by: mreynolds (Thanks!)