Freeport LNG, the second-largest U.S. liquefied natural gas exporter, on Monday said it had completed repairs to its Texas plant and asked U.S. regulators for permission to take early steps to restart the fire-idled facility.The closely-held liquified natural gas (LNG) company's export facility was knocked offline by a fiery blast on June 8 and barred from resuming production until federal regulators completed an extensive safety review and approved resulting changes.Freeport LNG sought permission to begin introducing LNG into the plant's piping system…