By Aishwarya Venugopal, Diane Bartz and Abigail Summerville (Reuters) – Kroger Co snapped up Albertsons Cos Inc in a $25 billion deal on Friday, creating a U.S. grocery behemoth to better compete with leader Walmart Inc on prices while bracing for potential antitrust roadblocks. The mega merger between the No. 1 and 2 standalone grocers in the United States will bring under one roof nearly 5,000 stores that include banners such as Albertsons’ Safeway and Kroger-owned Ralphs and Fred Meyer. The U.S. Federal Trade Commission (FTC) could, however, challenge the deal between the two major grocers …