NAIROBI, Aug 15( Reuters)-Kenya has reinstated a small subsidy to stabilise retail fuel prices for the next 30 days, the energy regulator said late on Monday, in a reversal of government policy following public anger over the high cost of living.On coming to office last September, President William Ruto removed fuel and maize flour subsidies put in place by his predecessor, saying he preferred subsidising production rather than consumption. The move was also aimed at cutting government spending