By Mari Saito and Kentaro Hamada TOKYO (Reuters) – Japan’s plan to restart nuclear reactors shut down after the Fukushima disaster will not be affected by Monday’s resignation of the industry minister, but Prime Minister Shinzo Abe is losing a convincing advocate of a step most view with suspicion. Forty-year-old Yuko Obuchi’s resignation from the Ministry of Economy, Trade and Industry, six weeks after she was appointed, is the latest hitch in a process bogged down by documentation over safety standards, concerns about natural disasters and local opposition. …