[Libguestfs] Fwd: virt-v2v-copy-to-local failed if dd does not support status=progress

If dd does not support status=progress, copy process will abort at the end. This is totally misguided. We can use -q as a workaround in this circumstance, but it is frightening to newbee like me. Maybe we should improve this. suspicion： ``` if shell_command cmd <> 0 then error (f_"ssh copy command failed, see earlier errors"); ``` detail： ``` shell > virt-v2v-copy-to-local -v -ic xen+ssh://myxen_server guest [ 0.0] Fetching the remote libvirt XML metadata ... [ 1.6] Parsing the remote libvirt XML metadata ... [ 1.6] Copying remote disk 1/2 to guest-disk1 dd: invalid status flag: ‘progress’ Try 'dd --help' for more information. 40960+0 records in 40960+0 records out 42949672960 bytes (43 GB) copied, 876.05 seconds, 49.0 MB/s virt-v2v-copy-to-local: error: ssh copy command failed, see earlier errors ```