Ticket 49540 - Indexing task is reported finished too early regarding the backend status
    
    Bug Description:
    	If a task complete successfully, its status is updated before the backend
    	can receive update.
    
    Fix Description:
    	postpone the task status update after backend is reenabled
    
    https://pagure.io/389-ds-base/issue/49540
    
    Reviewed by: Ludwig Krispenz
    
    Platforms tested: F26
    
    Flag Day: no
    
    Doc impact: no