METALS--Shanghai zinc rises for first session in eight as consumers buy

(Updates prices, adds details) By Melanie Burton MELBOURNE, May 7 (Reuters) - Shanghai zinc futures rose for the first time in eight sessions, rallying more than 2 percent on Monday, on a mix of short-covering and buying by consumers of the steel-making metal that has been in a shortage for much of the past year. FUNDAMENTALS * ZINC: Shanghai Futures Exchange (ShFE) zinc rose 2.3 percent to close at 23,910 yuan ($3,756.19) per tonne. This was the first day of gains since