Fixed the root path check in the validate_cmakelists script.
Fixed the root path check in the validate_cmakelists script.

zuyu/incubator-quickstep,UWQuickstep/quickstep,hbdeshmukh/incubator-quickstep,UWQuickstep/quickstep,hbdeshmukh/incubator-quickstep,UWQuickstep/quickstep,jianqiao/incubator-quickstep,jianqiao/incubator-quickstep,hbdeshmukh/incubator-quickstep,hbdeshmukh/incubator-quickstep,zuyu/incubator-quickstep,zuyu/incubator-quickstep,zuyu/incubator-quickstep,jianqiao/incubator-quickstep,UWQuickstep/quickstep,UWQuickstep/quickstep,jianqiao/incubator-quickstep