sslutil: move CA file processing into _hostsettings() The CA file processing code has been moved from _determinecertoptions into _hostsettings(). As part of the move, the logic has been changed slightly and the "cacerts" variable has been renamed to "cafile" to match the argument used by SSLContext.load_verify_locations(). Since _determinecertoptions() no longer contains any meaningful code, it has been removed.