'Will delete all the segments in the SLO manifest and then, if
successful, will delete the manifest file.
:params req: a swob.Request with an obj in path
:returns: swob.Response whose app_iter set to Bulk.handle_delete_iter'

def handle_multipart_delete(self, req):

    req.headers['Content-Type'] = None
    resp = HTTPOk(request=req)
    out_content_type = req.accept.best_match(ACCEPTABLE_FORMATS)
    if out_content_type:
        resp.content_type = out_content_type
    resp.app_iter = self.bulk_deleter.handle_delete_iter(req, objs_to_delete=self.get_segments_to_delete_iter(req), user_agent='MultipartDELETE', swift_source='SLO', out_content_type=out_content_type)
    return resp
