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Michael Chapman d17b2d9d5d qemu_driver: check caps after starting block job
Currently we check qemuCaps before starting the block job. But qemuCaps
isn't available on a stopped domain, which means we get a misleading
error message in this case:

  # virsh domstate example
  shut off

  # virsh blockjob example vda
  error: unsupported configuration: block jobs not supported with this QEMU binary

Move the qemuCaps check into the block job so that we are guaranteed the
domain is running.

Signed-off-by: Michael Chapman <mike@very.puzzling.org>
(cherry picked from commit cfcdf5ff01aa96a0afcf8f1984967c7eaa2b4330)
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         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>
Description
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
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