I am unable to import VM's migrated with virt-v2v-1.28.1-1.28.el7.x86_64 / libguestfs-1.28.1-1.28.el7.x86_64.  There is a virt-v2v bug on this, but it is identified as a oVirt issue - https://bugzilla.redhat.com/show_bug.cgi?id=1213701