By Margaret Chadbourn and Roberta Rampton WASHINGTON (Reuters) – The U.S. government is switching providers of Web hosting services for the troubled HealthCare.gov website, replacing Verizon Communications Incs Terremark subsidiary with Hewlett-Packard Co, the Centers for Medicare and Medicaid Services said on Wednesday. The contract with Terremark for the sites data center ends in March 2014, and last summer – after CMS issued a task order, HP was the successful bidder, a CMS spokesman said in a statement. Now, CMS needs to transition its data center to HP at a time when it is just beginning to dig out from a mountain of problems with the website, which is designed to let consumers shop for health insurance required under President Barack Obamas signature reform law.