By Tom Käckenhoff, Vera Eckert and Christoph Steitz DUESSELDORF/FRANKFURT, Germany (Reuters) -Germany’s network regulator, which would be in charge of gas rationing in the event of a supply emergency, has received scores of exemption requests from across industry, reflecting fears of potential production cuts and subsequent losses. Germany is at phase two of a three-stage emergency plan following a reduction in gas flows from Russia, its main supplier, a major problem for industry, which accounts for a quarter of the country’s gas demand. Chancellor Olaf Scholz said on Tuesday gas prices, whic…