qemu: consider available CPUs in iothread info output
qemu: consider available CPUs in iothread info output

Following the rationale from commit
<2020c6af8a8e4bb04acb629d089142be984484c8> we should do the same thing
for iothread info as well.

Signed-off-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>
Reviewed-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

zippy2/libvirt,crobinso/libvirt,olafhering/libvirt,zippy2/libvirt,crobinso/libvirt,jfehlig/libvirt,nertpinx/libvirt,olafhering/libvirt,crobinso/libvirt,zippy2/libvirt,olafhering/libvirt,olafhering/libvirt,jardasgit/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,jardasgit/libvirt,zippy2/libvirt,jfehlig/libvirt,libvirt/libvirt,nertpinx/libvirt,libvirt/libvirt,jardasgit/libvirt,jfehlig/libvirt,libvirt/libvirt,jardasgit/libvirt,nertpinx/libvirt,jardasgit/libvirt,jfehlig/libvirt,nertpinx/libvirt