/etc/sudoers.d/ironic_sudoers is in ironic-common 2014.1~rc1-0ubuntu1.
This file is owned by root:root, with mode 0o440.
The actual contents of the file can be viewed below.
1 2 3 | Defaults:ironic !requiretty
ironic ALL = (root) NOPASSWD: /usr/bin/ironic-rootwrap
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