Get dict section2usrnts.

def get_section2usrnts(self):
        """Get dict section2usrnts."""
        sec_nts = []
        for section_name, _ in self.get_sections_2d():
            usrgos = self.get_usrgos_g_section(section_name)
            sec_nts.append((section_name, [self.go2nt.get(u) for u in usrgos]))
        return cx.OrderedDict(sec_nts)