[Libguestfs] [PATCH v2 0/3] Implement guestfs_add_libvirt_dom.

This completes the implementation on the libguestfs side, allowing python-libvirt dom pointers to be passed to guestfs_add_libvirt_dom. For context see: https://bugzilla.redhat.com/show_bug.cgi?id=1138203#c40 https://bugzilla.redhat.com/show_bug.cgi?id=1075143 https://bugzilla.redhat.com/show_bug.cgi?id=1075164 Rich.