MANCHESTER, N.H. — With a roar of discontent toward the political establishment, New Hampshire voters sent the presidential contest into what seems likely to be an extended march that will quickly move to territory far less hospitable to Tuesday night’s big winners, Bernie Sanders and Donald Trump.After a riotous eight days that ended with the first successful Democratic insurgent win here since 1984 and the first Republican win ever by a TV host and real estate entrepreneur, the races now diverge.