qemu: Add hotplug support for scsi host device
qemu: Add hotplug support for scsi host device

This adds both attachment and detachment support for scsi host
device.

Signed-off-by: Han Cheng <dcdf1d18673d78e4131524dacc5542a8029dac6c@cn.fujitsu.com>
Signed-off-by: Osier Yang <d854f27e52c3c8670cc141b8492808363459e2bd@redhat>

datto/libvirt,agx/libvirt,libvirt/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,taget/libvirt,jardasgit/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,nertpinx/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,agx/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,rlaager/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,eskultety/libvirt,fabianfreyer/libvirt,eskultety/libvirt,jfehlig/libvirt,zippy2/libvirt,agx/libvirt,VenkatDatta/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,VenkatDatta/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,eskultety/libvirt,nertpinx/libvirt,jardasgit/libvirt,libvirt/libvirt,VenkatDatta/libvirt,crobinso/libvirt,fabianfreyer/libvirt,cbosdo/libvirt,olafhering/libvirt,shugaoye/libvirt,agx/libvirt,nertpinx/libvirt,shugaoye/libvirt,taget/libvirt,jardasgit/libvirt,libvirt/libvirt,crobinso/libvirt,nertpinx/libvirt,olafhering/libvirt,elmarco/libvirt,datto/libvirt,shugaoye/libvirt,libvirt/libvirt,datto/libvirt,datto/libvirt,cbosdo/libvirt,agx/libvirt,shugaoye/libvirt,jfehlig/libvirt,shugaoye/libvirt,jardasgit/libvirt,taget/libvirt,rlaager/libvirt,VenkatDatta/libvirt,datto/libvirt,elmarco/libvirt,crobinso/libvirt,eskultety/libvirt,rlaager/libvirt,elmarco/libvirt,taget/libvirt,rlaager/libvirt,olafhering/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,cbosdo/libvirt,rlaager/libvirt,cbosdo/libvirt,eskultety/libvirt,olafhering/libvirt,zhlcindy/libvirt-1.1.4-maintain,zippy2/libvirt,zippy2/libvirt,cbosdo/libvirt,jardasgit/libvirt,nertpinx/libvirt,crobinso/libvirt,elmarco/libvirt