/usr/share/autopkgtest/xenlvm/justconfig is in autopkgtest-xenlvm 2.0.1ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | exec 8>&1 >/dev/null
adt_whenlock_replumb81=y
. ${ADT_XENLVM_SHARE:=/usr/share/autopkgtest/xenlvm}/readconfig
exec >&8 8>&-
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