The decade-old dispute between Memphis-Shelby County Schools and the Germantown Municipal School District ended Thursday as the two districts’ school boards signed off on a deal that allows Germantown to take over two schools currently operated by MSCS.The resolution, spurred by a new state law, means that thousands of MSCS students who attend the Germantown Elementary, Middle and High schools — known collectively as the “three G’s” — will be able to remain in those schools as the buildings begin a transition to the Germantown district’s control.