qemu: remove deadcode in qemuDomain{HelperGetVcpus|GetIOThreadsLive}
qemu: remove deadcode in qemuDomain{HelperGetVcpus|GetIOThreadsLive}

We set @hostcpus variable but not use it.

Signed-off-by: Luyao Huang <23d9981432efa88691fd2a71f5525bc2174f7664@redhat.com>

VenkatDatta/libvirt,zippy2/libvirt,VenkatDatta/libvirt,olafhering/libvirt,jardasgit/libvirt,taget/libvirt,crobinso/libvirt,eskultety/libvirt,rlaager/libvirt,datto/libvirt,agx/libvirt,datto/libvirt,agx/libvirt,rlaager/libvirt,taget/libvirt,jfehlig/libvirt,olafhering/libvirt,eskultety/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,olafhering/libvirt,jfehlig/libvirt,crobinso/libvirt,crobinso/libvirt,agx/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,jfehlig/libvirt,agx/libvirt,jardasgit/libvirt,eskultety/libvirt,datto/libvirt,zippy2/libvirt,jardasgit/libvirt,libvirt/libvirt,VenkatDatta/libvirt,taget/libvirt,eskultety/libvirt,zippy2/libvirt,agx/libvirt,taget/libvirt,fabianfreyer/libvirt,libvirt/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,crobinso/libvirt,nertpinx/libvirt,andreabolognani/libvirt,taget/libvirt,rlaager/libvirt,jfehlig/libvirt,nertpinx/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,eskultety/libvirt,rlaager/libvirt,nertpinx/libvirt,datto/libvirt,olafhering/libvirt,jardasgit/libvirt,zippy2/libvirt,rlaager/libvirt,libvirt/libvirt,jardasgit/libvirt,libvirt/libvirt,datto/libvirt,fabianfreyer/libvirt