By Tom Käckenhoff and Christoph Steitz DUESSELDORF, Germany (Reuters) – RWE’s municipal investors, which together form the top shareholder in Germany’s largest power producer, have dismissed calls for a fast separation of the group’s brown coal division, adding such a move would threaten the local economy and jobs. The Association of Municipal RWE shareholders (VkA) mostly represents cities and municipalities in North Rhine-Westphalia, Germany’s most populous state and home to RWE and other industrial heavyweights, including Thyssenkrupp. Overall, the VkA represents 14.1% of RWE’s shares, a st…