Osier Yang fd1432c7ae qemu: Error out if the bitmap for pinning is all clear
For both "live" and "config" changes of vcpupin and emulatorpin, an
all clear bitmap doesn't make sense, and it can just cause corruptions.
E.g (similar for emulatorpin).

% virsh vcpupin hame 0 8,^8 --config

% virsh vcpupin hame
VCPU: CPU Affinity
----------------------------------
   0:
   1: 0-63
   2: 0-63
   3: 0-63

% virsh dumpxml hame | grep cpuset
    <vcpupin vcpu='0' cpuset=''/>

% virsh start hame
error: Failed to start domain hame
error: An error occurred, but the cause is unknown
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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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