case update: blockcopy dest xml for block disk with iscsi preparation

[nanli1]

xxxx-294410:Do blockcopy with different dest XML

Signed-off-by: nanli [email protected]

 avocado run --vt-type libvirt --test-runner=runner --vt-machine-type q35 backingchain.blockcopy.dest_xml.block_disk.finish_reuse_external --vt-connect-uri qemu:///system
 (1/1) type_specific.io-github-autotest-libvirt.backingchain.blockcopy.dest_xml.block_disk.finish_reuse_external: PASS (60.01 s)

Others related

avocado run --vt-type libvirt --test-runner=runner --vt-machine-type q35 guest_os_booting.boot_order.hotplug backingchain.blockcopy.zero_length_disk snapshot_revert.xml_updated virtual_disks.discard_no_unref
 (01/19) type_specific.io-github-autotest-libvirt.guest_os_booting.boot_order.hotplug.disk_device: PASS (24.58 s)
 (02/19) type_specific.io-github-autotest-libvirt.guest_os_booting.boot_order.hotplug.usb_device: PASS (30.72 s)
 (03/19) type_specific.io-github-autotest-libvirt.guest_os_booting.boot_order.hotplug.filesystem_device: PASS (31.42 s)
 (04/19) type_specific.io-github-autotest-libvirt.backingchain.blockcopy.zero_length_disk.with_transient_job: PASS (9.19 s)
 (05/19) type_specific.io-github-autotest-libvirt.snapshot_revert.xml_updated.hotplug_disk: PASS (55.68 s)
 (06/19) type_specific.io-github-autotest-libvirt.snapshot_revert.xml_updated.hotplug_vcpus: PASS (58.03 s)
 (07/19) type_specific.io-github-autotest-libvirt.snapshot_revert.xml_updated.blkiotune: PASS (55.12 s)
 (08/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.start_vm.enable.with_discard_unmap.file_disk: PASS (37.75 s)
 (09/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.start_vm.enable.with_discard_unmap.block_disk: PASS (47.20 s)
 (10/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.start_vm.enable.with_discard_ignore.file_disk: PASS (34.97 s)
 (11/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.start_vm.enable.with_discard_ignore.block_disk: PASS (47.02 s)
 (12/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.start_vm.disable.with_discard_unmap.file_disk: PASS (34.85 s)
 (13/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.start_vm.disable.with_discard_unmap.block_disk: PASS (46.89 s)
 (14/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.start_vm.disable.with_discard_ignore.file_disk: PASS (34.50 s)
 (15/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.start_vm.disable.with_discard_ignore.block_disk: PASS (46.88 s)
 (16/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.hotplug_disk.enable.with_discard_unmap.file_disk: PASS (35.87 s)
 (17/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.define_invalid.raw_format.enable.with_discard_unmap.file_disk: PASS (5.91 s)
 (18/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.define_invalid.readonly_mode.enable.with_discard_unmap.file_disk: PASS (5.82 s)
 (19/19) type_specific.io-github-autotest-libvirt.virtual_disks.discard_no_unref.update_negative.enable.with_discard_unmap.file_disk: PASS (32.63 s)

[chunfuwen]

lgtm

[cliping]

LGTM