Description of problem:
The virDomainBlockCopy is libvirt is required for several flows which change snapshots, specifically LSM and (live) merge.
Looking forward, we should drop support for libvirt versions that don't provide it, and require ones that do.
For Fedora: libvirt-python-1.2.9-2 (see bug 1199682)
For EL: libvirt-python-1.2.8-5 (see bug 1155484)
(In reply to Ori Gofen from comment #1)
> on rhel the require has been met, on fedora20 the installed package has
> lower viersion:
We do not support fedora 20 any more. Please test with fedora 21.