Orange SA is seeking to raise €400 million ($465 million) to €500 million in a stake sale in some of its data centers in France, according to people familiar with the matter.The telecom operator is selling a stake of as much as 50% in data center business including its major facility in Normandy, said the people, who asked not to be identified as the information is private. Evercore Inc. is helping with the potential deal, the people said....