[Libguestfs] [PATCH v2v] lib: Use an ACL to allow qemu to access the v2v directory

For fuller explanation see: https://bugzilla.redhat.com/show_bug.cgi?id=2066773#c1 I'm not very happy with this patch for a few reasons: - Does every distro use "qemu" as the user that runs qemu? - Having to run an external process (not a big deal, but a bit clumsy) - Aren't ACLs actually deprecated? Anyway the patch does at least work in my local testing. Rich.