Last night’s game against the Utah Jazz was the Celtics’ fifth in seven days. It’s been a rough start to the stretch run that follows the All-Star break, and if ever there was a team in need of an oasis, it’s this group. It couldn’t be more beneficial, then, that the NBA schedule gods have finally decided to smile on the Celtics with a seven-day stretch that includes only one game. Starting today, the C’s have three days off before their next game, Friday night at home against Golden State. The Warriors game is followed by three more off days before the Celts hit the road for a back-to-back swing against the Philadelphia 76ers and Indiana Pacers. Kevin Garnett, Paul Pierce and Jason Terry can expect to spend a significant portion of the next seven days in enforced rest mode. But with newcomers D.J. White, Terrence Williams and Jordan Crawford all in equally serious need of practice time, coach Doc Rivers plans to run the non-veteran portion of his team through something approaching a mini-training camp.