/usr/share/live/build/hooks/normal/0160-remove-openssh-server-host-keys.hook.chroot is in open-infrastructure-system-build 20161101-lts2-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
set -e
# Remove OpenSSH Host Keys.
#
# This removes openssh-server host keys, they are regenerated by system-config
# on system start.
rm -f /etc/ssh/ssh_host_*_key /etc/ssh/ssh_host_*_key.pub
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