By Renju Jose SYDNEY (Reuters) -Heavy rains deluged Australia’s east coast on Wednesday, submerging entire towns, while thousands of people fled their homes for the second time within weeks after fast-moving flood waters burst river banks and broke over levees. Several towns in northern New South Wales, already reeling after record floods over a month ago, were pounded by an intense low-pressure system overnight. Some regions took a month’s rainfall in under six hours, officials said. “Unfortunately overnight, our worst fears have been realised with significant heavy rainfall across already sa…