KOTA BHARU, Aug 23 — A Malaysian visitor to Sungai Golok in southern Thailand found himself caught in a night of chaos after a string of bomb blasts sent military and fire trucks onto the streets and triggered roadblocks across the border town.The visitor, identified only as Main, told The New Straits Times that key roads were closed by security personnel shortly after the explosions began.The 35-year-old arrived in Golok with a friend yesterday…