OAKLAND — If all goes as planned this weekend, David Henry will finish with his third straight unbeaten season and become Oakland High’s first three-time state wrestling champion. The 17-year-old senior (30-0) is the No. 1 seed and heavily-favored to defend his 220-pound title in the OSAA Class 2A tournament, which begins Friday morning at Veterans Memorial Coliseum in Portland. The championship finals are scheduled to begin at 6:30 p.m. Saturday. Henry won the 215-pound crown as a sophomore. He hasn’t lost a high school match since falling to Nestucca’s Phillip Sigle in the state semifinals as a freshman in …