RBI policy spooks markets; Sensex tanks 582 pointsAmong the 30 Sensex firms, Asian Paints, Infosys, JSW Steel, UltraTech Cement, Power Grid, Larsen & Toubro, HCL Technologies and Tata Steel were the biggest laggards. Tata Motors, HDFC Bank, Bharti Airtel, ITC, IndusInd Bank and Axis...