adding OsdVertex to the OpenSubdiv namespace
adding OsdVertex to the OpenSubdiv namespace

lookup1980/OpenSubdiv,c64kernal/OpenSubdiv,takahito-tejima/OpenSubdiv,nyotis/OpenSubdiv,xldeveloper/OpenSubdiv,xldeveloper/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,anshuarya/OpenSubdiv,lookup1980/OpenSubdiv,anshuarya/OpenSubdiv,shengfuintel/OpenSubdiv,jcowles/OpenSubdiv,poljere/OpenSubdiv,c64kernal/OpenSubdiv,xldeveloper/OpenSubdiv,c64kernal/OpenSubdiv,jcowles/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,shengfuintel/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,nyotis/OpenSubdiv,takahito-tejima/OpenSubdiv-exp,shengfuintel/OpenSubdiv,anshuarya/OpenSubdiv,poljere/OpenSubdiv,nyotis/OpenSubdiv,lookup1980/OpenSubdiv,poljere/OpenSubdiv,takahito-tejima/OpenSubdiv,jcowles/OpenSubdiv,takahito-tejima/OpenSubdiv