After nearly two days of deliberation, a federal jury returned a not guilty verdict Friday in the sprawling bribery case against Keith Kaneshiro, Honolulu’s longest-serving prosecutor. The decision comes nearly two years after Kaneshiro and five others were indicted on conspiracy to commit honest services fraud, bribery and conspiracy against rights. Verdicts were also handed down for the others in the case — all campaign donors affiliated with a high-profile Honolulu engineering firm.