/etc/vmbuilder/debian/sources.list.tmpl is in python-vm-builder 0.12.4+bzr494-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | deb $mirror $suite #slurp
#echo ' '.join($components)
deb $updates_mirror $suite-updates #slurp
#echo ' '.join($components)
deb $security_mirror $suite/updates #slurp
#echo ' '.join($components)
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