Indian e-commerce player Flipkart might go for an Ipo in as early as four years if minority investors holding 60% of its shares wish to do so, Walmart said in a filing to the SEC.The U.S. retail giant agreed to pay $16B last week for a roughly 77% stake in Flipkart, a private company, valuing the Indian e-commerce player at a little less than $21B.Flipkart, 100 mln of registered clients,  has strong...