virt-sysprep: no operating systems were found in the guest image

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Issue

When performing virt-sysprep on a RHEL7 guest image, see below error:

# virt-sysprep -a /home/vm/RHEL72_ks_sysprep.qcow2
Examining the guest ...
virt-sysprep: no operating systems were found in the guest image

Environment

Red Hat Enterprise Linux 7 VM guest image, with separated /usr partition.
libguestfs prior to libguestfs-1.32.7-3.el7 or libguestfs-1.20.11-20.el6.

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