/etc/sudoers.d/neutron_sudoers is in neutron-common 1:2014.1-0ubuntu1.
This file is owned by root:root, with mode 0o440.
The actual contents of the file can be viewed below.
1 2 3 | Defaults:neutron !requiretty
neutron ALL = (root) NOPASSWD: /usr/bin/neutron-rootwrap
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