Hong Kong’s legislature has been a simmering cauldron of tensions over the past few years, but on Saturday emotions boiled over as lawmakers pushed and shoved each other while fighting for control of a committee.A veteran pan-democrat’s tearful face, as he pleaded a rival “not to be remembered as a sinner” for selling Hong Kong out, became the most evocative image of the clashes.The scene was repeatedly shown on local and international TV as onlookers shook their heads at the degradation of…