Wall Street opened higher following upbeat results from Walt Disney Co DIS.N and Cisco Systems Inc CSCO.O. By Lucia Mutikani WASHINGTON, Nov 13 (Reuters) - U.S. producer prices increased for a sixth straight month in October amid more expensive food and gasoline, but the trend remained moderate, supporting views of tame inflation given labor market slack and a resurgence in new coronavirus cases. Lukewarm inflation gives the Federal Reserve scope to maintain its ultra-easy monetary policy as it nurses the recovery from the worst economic crisis since the Great Depression.