By Kane Wu HONG KONG (Reuters) -JingDong Industrials, a unit of Chinese online retailer JD.com, is seeking to raise $500 million with a Hong Kong initial public offering (IPO) as soon as the end of October, two sources with direct knowledge said, after the firm cleared a key regulatory hurdle. The company, also known as JDi, refiled for a Hong Kong listing on Sunday after receiving the green light from China's securities regulator last week, more than two years after it first notified the China Securitie ...