PARIS (Reuters) - Renault and PSA Group face a potential stand-off with French workers worried that an industry drive to meet EU emissions targets will fuel demands for concessions in upcoming labour negotiations. Renault and Peugeot maker PSA are seeking to renew three-year, nationwide pacts covering wages and other working conditions in the coming months, which in the past have allowed them to trim costs. Informal labour talks between Renault and workers began in early September, unions..