/usr/lib/python2.7/dist-packages/maasserver/templates/maasserver/sshkeys.txt is in python-django-maas 1.5.4+bzr2294-0ubuntu1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | {% for key in keys %}{{ key|safe }}
{% endfor %}
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