BEIJING (Reuters) -Freezing rain, snow and ice have snarled traffic in central and eastern China as billions of people travel home ahead of the Spring Festival holiday in the blistering cold weather that has swept through parts of the country over the past week. Hunan and Hubei provinces have borne the brunt of the severe weather, which worsened over the weekend, slowing highway traffic to a crawl and cancelling hundreds of trains. Over the past few days, videos across Chinese social media showe