Description of problem:
[RFE]Virt-v2v supports converting guest with RDM disk from VMware

Version-Release number of selected component (if applicable):
virt-v2v-2.0.7-6.el9.x86_64
libguestfs-1.48.4-3.el9.x86_64
guestfs-tools-1.48.2-7.el9.x86_64
libvirt-libs-8.9.0-2.el9.x86_64
qemu-img-7.1.0-5.el9.x86_64
nbdkit-server-1.30.8-1.el9.x86_64
libnbd-1.12.6-1.el9.x86_64

How reproducible:
90%

Steps to Reproduce:
1.Prepare a guest on ESXi7.0.3 host and add a RDM disk to the guest, pls refer to sreenshots 'vmware-guest-with-RDM-disk'

2.Use virsh to dump the guest libvirtxml from VMware, can see the RDM disk info in guest libvirtxml

1. virsh -c vpx://root@10.73.227.27/data/10.73.225.34/?no_verify=1 dumpxml esx7.0-rhel9.2-x86_64-with-RDM-disk
   Enter root's password for 10.73.227.27:
   <domain type='vmware' xmlns:vmware='http://libvirt.org/schemas/domain/vmware/1.0'>
   <name>esx7.0-rhel9.2-x86_64-with-RDM-disk</name>
   .....
   <devices>
   <disk type='file' device='disk'>
   <source file='[datastore2] esx7.0-rhel9.2-x86_64/esx7.0-rhel9.2-x86_64.vmdk'/>
   <target dev='sda' bus='scsi'/>
   <address type='drive' controller='0' bus='0' target='0' unit='0'/>
   </disk>
   <disk type='file' device='disk'>
   <source file='[datastore2] esx7.0-rhel9.2-x86_64/esx7.0-rhel9.2-x86_64_2.vmdk'/>
   <target dev='sdb' bus='scsi'/>
   <address type='drive' controller='0' bus='0' target='0' unit='1'/>
   </disk>
   ....
   </domain>

3.Convert the guest from ESXi7.0.3 by v2v

1. virt-v2v -ic vpx://root@10.73.227.27/data/10.73.225.34/?no_verify=1 -it vddk -io vddk-libdir=/home/vddk7.0.3 -io vddk-thumbprint=76:75:59:0E:32:F5:1E:58:69:93:75:5A:7B:51:32:C5:D1:6D:F1:21 -ip /home/passwd esx7.0-rhel9.2-x86_64-with-RDM-disk
   [ 0.2] Setting up the source: -i libvirt -ic vpx://root@10.73.227.27/data/10.73.225.34/?no_verify=1 -it vddk esx7.0-rhel9.2-x86_64-with-RDM-disk
   [ 3.1] Opening the source
   nbdkit: vddk[1]: error: VixDiskLib_Open: [datastore2] esx7.0-rhel9.2-x86_64/esx7.0-rhel9.2-x86_64_2.vmdk: Unknown error
   nbdkit: vddk[1]: error: Please verify whether the "thumbprint" parameter (76:75:59:0E:32:F5:1E:58:69:93:75:5A:7B:51:32:C5:D1:6D:F1:21) matches the SHA1 fingerprint of the remote VMware server. Refer to nbdkit-vddk-plugin(1) section "THUMBPRINTS" for details.
   virt-v2v: error: libguestfs error: could not create appliance through
   libvirt.

Try running qemu directly without libvirt using this environment variable:
export LIBGUESTFS_BACKEND=direct

Original error from libvirt: internal error: process exited while
connecting to monitor: 2022-11-24T07:50:08.231660Z qemu-kvm: -blockdev
{"driver":"nbd","server":

,"node-name":"libvirt-2-storage","cache":

,"auto-read-only":true,"discard":"unmap"}:
Requested export not available [code=1 int1=-1]

If reporting bugs, run virt-v2v with debugging enabled and include the
complete output:

virt-v2v -v -x [...]

Actual results:
Virt-v2v can't convert guest with RDM disk from VMware

Expected results:
As above description

Additional info: