By Helen Reid and Greta Rosen Fondahn LONDON/STOCKHOLM (Reuters) -IKEA has acquired U.S. logistics technology firm Locus, the two companies said on Tuesday, a deal the Swedish furniture retailer said would make its deliveries to shoppers smoother and faster as it invests to expand online sales. The takeover is in addition to a $2.2 billion push by Ingka Group, the biggest global IKEA franchisee, in the U.S. where it competes with Wayfair and Walmart and is also contending with higher tariffs on imports t ...