升级iOS10后，Xcode运行程序到真机报错，提示Could not find developer disk image，Xcode Device栏处的真机右侧显示“（unavailable）” 从xcode8 beta6里提取的iOS10 beta7的DeveloperDiskImage 放置路径 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport