In a strong message to adults tempted to host booze parties for underaged drinkers, a Salem judge has sentenced a Beverly woman to serve six months in jail for permitting teenaged drinking at her home two years ago. It was believed to be the first time a person was sent to jail under the state’s social host law where a fatality was not involved. Tiffany Clark, 37, of Manor Road, was taken into custody on Thursday immediately upon her sentencing.