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Neutron uses root-wrap to execute shell commands.

https://wiki.openstack.org/wiki/Rootwrap

Not sure how you installed neutron but it looks like /etc/sudoers.d/neutron_sudoers is not there or doesnt have the correct contents.

In /etc/sudoers.d/neutron_sudoers you need to have this:

Defaults:neutron !requiretty

neutron ALL = (root) NOPASSWD: /usr/bin/neutron-rootwrap

This file should be on all dhcp nodes.