fix python3 test failure
fix python3 test failure

geopython/OWSLib,Jenselme/OWSLib,geographika/OWSLib,bird-house/OWSLib,JuergenWeichand/OWSLib,ocefpaf/OWSLib,mbertrand/OWSLib,KeyproOy/OWSLib,kwilcox/OWSLib,jachym/OWSLib,tomkralidis/OWSLib,kalxas/OWSLib,QuLogic/OWSLib