def opt_node_name_prefix(self, node_name_prefix):
        self.setdefault('node-name-prefixes', []).append(
            node_name_prefix
        )
Regression test for #10034: the hash generation function should ignore
dataset/ETHPy150Open ClusterHQ/flocker/admin/cleanup.py/CleanupCloudResourcesOptions.opt_node_name_prefix--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/contrib/formtools/tests/__init__.py/SecurityHashTests.test_textfield_hash