By Mike Scandura NEFJ Correspondent WARWICK- Discipline. As much as anything that was the difference in No. 1 Hendricken’s 21-20 overtime victory against No. 4 Central in a Division I semifinal game Friday night. The Hawks (8-1) won the coin toss prior to overtime, deferred and Central (3-7) took advantage. It scored on a six-yard run off right tackle by quarterback Avani Rodrigues. But in an eyeblink the Knights were……