SharePoint 2013 Configuration wizard still in-progress

http://expertsharepoint.blogspot.de/2014/03/operations-started-by-earlier-run-of.html

http://www.sharepointcoskun.com/2010/12/29/operations-started-by-an-earlier-run-of-the-farm-configuration-wizard-are-still-in-progress/

http://social.technet.microsoft.com/wiki/contents/articles/25758.operations-started-by-an-earlier-run-of-the-farm-configuration-wizard-are-still-in-progress.aspx