Comment 5 for bug 1930401

according to log dhcp agent hangs at:
https://github.com/openstack/oslo.privsep/blob/master/oslo_privsep/daemon.py#L363

when spawning daemon for with neutron.privileged.default context:

Running privsep helper: ['sudo', '/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/bin/neutron-rootwrap', '/home/zuul/src/opendev.org/openstack/neutron/.tox/dsvm-fullstack-gate/etc/neutron/rootwrap.conf', 'privsep-helper', '--config-file', '/tmp/tmp85j24qwy/tmp66u3c94b/neutron.conf', '--config-file', '/tmp/tmp85j24qwy/tmp66u3c94b/dhcp_agent.ini', '--privsep_context', 'neutron.privileged.default', '--privsep_sock_path', '/tmp/tmpihodg8vw/privsep.sock']