qemu: Return SPICE ports on domain shutdown
qemu: Return SPICE ports on domain shutdown

Commit ed0d9f6c0cdd56f38ce31b8d9b5293162addaa23 added support for
automatic port allocation for SPICE but forgot to mark such ports as
unused when they are not used anymore.

jeckersb/libvirt,eskultety/libvirt,wiedi/libvirt,rmarwaha/libvirt1,andreabolognani/libvirt,dumbbell/libvirt,nertpinx/libvirt,soulxu/libvirt-xuhj,warewolf/libvirt,rmarwaha/libvirt1,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,trainstack/libvirt,foomango/libvirt,trainstack/libvirt,emaste/libvirt,VenkatDatta/libvirt,soulxu/libvirt-xuhj,libvirt/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,jfehlig/libvirt,dumbbell/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,shugaoye/libvirt,usc-isi/libvirt,jfehlig/libvirt,dumbbell/libvirt,danwent/libvirt-ovs,agx/libvirt,agx/libvirt,kantai/libvirt-vfork,datto/libvirt,leilihh/libvirt,dumbbell/libvirt,taget/libvirt,leilihh/libvirt,emaste/libvirt,taget/libvirt,zippy2/libvirt,jeckersb/libvirt,jeckersb/libvirt,cbosdo/libvirt,trainstack/libvirt,siboulet/libvirt-openvz,olafhering/libvirt,leilihh/libvirt,novel/fbsd-libvirt,fabianfreyer/libvirt,rlaager/libvirt,rmarwaha/libvirt,kantai/libvirt-vfork,jardasgit/libvirt,trainstack/libvirt,siboulet/libvirt-openvz,rlaager/libvirt,rmarwaha/libvirt,rmarwaha/libvirt1,elmarco/libvirt,andreabolognani/libvirt,datto/libvirt,zhlcindy/libvirt-1.1.4-maintain,agx/libvirt,elmarco/libvirt,VenkatDatta/libvirt,trainstack/libvirt,libvirt/libvirt,emaste/libvirt,rmarwaha/libvirt,nertpinx/libvirt,datto/libvirt,zippy2/libvirt,taget/libvirt,zippy2/libvirt,zhlcindy/libvirt-1.1.4-maintain,novel/fbsd-libvirt,usc-isi/libvirt,danwent/libvirt-ovs,trainstack/libvirt,novel/fbsd-libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,shugaoye/libvirt,foomango/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,dumbbell/libvirt,danwent/libvirt-ovs,warewolf/libvirt,jardasgit/libvirt,olafhering/libvirt,bjzhang/libvirt,rmarwaha/libvirt,warewolf/libvirt,nertpinx/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,danwent/libvirt-ovs,kantai/libvirt-vfork,fabianfreyer/libvirt,crobinso/libvirt,warewolf/libvirt,cbosdo/libvirt,iam-TJ/libvirt,jardasgit/libvirt,jeckersb/libvirt,iam-TJ/libvirt,olafhering/libvirt,rmarwaha/libvirt,jardasgit/libvirt,crobinso/libvirt,leilihh/libvirt,novel/fbsd-libvirt,olafhering/libvirt,emaste/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,nertpinx/libvirt,leilihh/libvirt,jfehlig/libvirt,novel/fbsd-libvirt,wiedi/libvirt,zippy2/libvirt,emaste/libvirt,wiedi/libvirt,libvirt/libvirt,VenkatDatta/libvirt,andreabolognani/libvirt,usc-isi/libvirt,novel/fbsd-libvirt,dumbbell/libvirt,trainstack/libvirt,soulxu/libvirt-xuhj,agx/libvirt,novel/fbsd-libvirt,eskultety/libvirt,wiedi/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,elmarco/libvirt,agx/libvirt,jeckersb/libvirt,crobinso/libvirt,rbu/libvirt,shugaoye/libvirt,bjzhang/libvirt,wiedi/libvirt,bjzhang/libvirt,soulxu/libvirt-xuhj,danwent/libvirt-ovs,rlaager/libvirt,jeckersb/libvirt,wiedi/libvirt,elmarco/libvirt,kantai/libvirt-vfork,rbu/libvirt,fabianfreyer/libvirt,eskultety/libvirt,jardasgit/libvirt,foomango/libvirt,iam-TJ/libvirt,taget/libvirt,rbu/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,warewolf/libvirt,siboulet/libvirt-openvz,datto/libvirt,soulxu/libvirt-xuhj,shugaoye/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt1,foomango/libvirt,jfehlig/libvirt,usc-isi/libvirt,cbosdo/libvirt,siboulet/libvirt-openvz,VenkatDatta/libvirt,siboulet/libvirt-openvz,fabianfreyer/libvirt,warewolf/libvirt,crobinso/libvirt,novel/fbsd-libvirt,wiedi/libvirt,datto/libvirt,warewolf/libvirt,libvirt/libvirt,taget/libvirt,leilihh/libvirt,jeckersb/libvirt,shugaoye/libvirt,iam-TJ/libvirt,usc-isi/libvirt,bjzhang/libvirt,emaste/libvirt,rlaager/libvirt,eskultety/libvirt,elmarco/libvirt,rbu/libvirt,foomango/libvirt,iam-TJ/libvirt,bjzhang/libvirt,rmarwaha/libvirt,iam-TJ/libvirt,emaste/libvirt,rmarwaha/libvirt1,andreabolognani/libvirt,cbosdo/libvirt,eskultety/libvirt,sshah-solarflare/Libvirt-PCI-passthrough-,rbu/libvirt,rmarwaha/libvirt1,kantai/libvirt-vfork