[Libguestfs] [PATCH 00/11] v2v: Change virt-v2v to use nbdkit for input in several modes.

This series (except the last one) changes virt-v2v to use nbdkit for several input modes: -i vmx -it vddk: No change in functionality, as this already uses nbdkit-vddk-plugin, but the code is refactored for the other modes to use. -i libvirtxml: Use nbdkit-curl-plugin instead of qemu curl. vCenter: Use nbdkit-curl-plugin instead of qemu curl. xen: Use nbdkit-ssh-plugin instead of qemu ssh. -i vmx -it ssh: Use nbdkit-ssh-plugin instead of qemu ssh. I was hoping to post this patch series when it was longer and showed some benefits. However those patches aren't ready quite yet, but these ones are ready for review. However some of the future benefits will be: * using nbdkit-rate-plugin to bandwidth limit the input side * better support for modern SSH encryption * possibility of SSH password auth (instead of requiring ssh-agent) I have tested this locally. Unfortunately none of the existing tests cover any of these input cases. The last patch reduces the minimum required version of nbdkit from 1.12 (not yet available) to 1.11, so this patch can be tested in Fedora 30. It is obviously not meant to be applied. Rich.