/etc/sudoers.d/nova_sudoers is in nova-common 2012.1.3+stable-20130423-e52e6912-0ubuntu1.4.
This file is owned by root:root, with mode 0o440.
The actual contents of the file can be viewed below.
1 2 3 | Defaults:nova !requiretty
nova ALL = (root) NOPASSWD: /usr/bin/nova-rootwrap
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