NEWARK — Two former allies of Gov. Chris Christie were sentenced Wednesday to prison terms for their roles in the George Washington Bridge lane closures, a bizarre political stunt that was designed to help the governor’s career but ended up halting his rapid march toward the White House.Bill Baroni, a former Republican state senator who served as Christie’s top appointee at the Port Authority of New York and New Jersey, was sentenced to a 24 months of incarceration.