'Load extensions specified on the command line.'

def _load_extensions(self):

    extensions = list(self.cls_list)
    for ext_factory in extensions:
        try:
            self.load_extension(ext_factory)
        except Exception as exc:
            LOG.warning('Failed    to    load    extension    %(ext_factory)s:    %(exc)s', {'ext_factory': ext_factory, 'exc': exc})
