PORTLAND, Maine — Two-time defending champion Eastern Connecticut State University leads by five strokes over Keene State College in the six-team field after the first day of the Little East Conference Men’s Golf Championships Thursday at the par-70 Riverside Golf Course. Eastern stands 23-over par 303, with Keene at 28-over 308. For Eastern, sophomore Nick DiNino (Glastonbury) — playing at No. 5 for the team — leads the Warriors and is tied for third overall at 5-over 75 among 30 players. Three Eastern players share fifth place at 6-over 76: Juniors Matt Orefice (Niantic) and co-captain Chris Davidson (New Milford)…