A man looks over the Affordable Care Act signup page on the HealthCare.gov website in New York in this photo illustrationBy means of David Morgan and Susan Cornwell WASHINGTON (Reuters) – Two months before the troubled October 1 launch of Obamacare exchanges, a key administration official overseeing this system assured a congressional oversight panel that work was on course to roll out a tested web page that might make it straightforward for Americans to join in affordable health insurance protection. …