Re: [Libguestfs] [PATCH v2] v2v: -o vdsm: Add --vdsm-compat-11 flag, -o rhev: Drop support for RHV < 4.1 (RHBZ#1400205).

Support for RHEV with RHEL 6 nodes required us to output the old style qcow2 compat=0.10 images. Since RHEV 3.6 GA, RHEL 6 has not been supported as a RHEV node type. Since RHV 4.1, compat=1.1 is supported. Support for compat=1.1 is uncertain in RHV 4.0 even on RHEL 7 nodes. There are significant downsides to using qcow2 compat=0.10 instead of the modern default (compat=1.1). Therefore this patch does two things: For -o rhev, it drops support for compat=0.10 completely. You now must use RHV 4.1. For -o vdsm, it adds an interim flag (--vdsm-compat-11) which turns off the previous behaviour. We can drop this flag later when all RHV instances have moved to 4.1. It also adds: vdsm-compat-11-option to the `virt-v2v --machine-readable' output to indicate that this flag can be used. Thanks: Yaniv Kaul, Michal Skrivanek. ---