San Jose-based Fortune Data Centers is rolling out a new name after joining forces with the massive Dallas Infomart data center, the company said Tuesday. The newly branded company will be known as Infomart Data Centers. It will run three data centers — in Dallas, Silicon Valley and Oregon — and will soon add a fourth to its portfolio after acquiring a major data center in Ashburn, Virginia. That facility — a former AOL data center — will open next year after a multimillion-dollar capital…