qemu: set seamless migration capability
qemu: set seamless migration capability

As we switched to setting capabilities based on QMP communication,
qemu seamless-migration capability was not set. In the -help output
this knob is called seamless-migration=[on|off]. The equivalent in
QMP world is SPICE_MIGRATE_COMPLETED event (qemu upstream commit
2fdd16e2).

jfehlig/libvirt,novel/fbsd-libvirt,siboulet/libvirt-openvz,trainstack/libvirt,bjzhang/libvirt,jeckersb/libvirt,agx/libvirt,elmarco/libvirt,zippy2/libvirt,shugaoye/libvirt,agx/libvirt,trainstack/libvirt,fabianfreyer/libvirt,emaste/libvirt,olafhering/libvirt,VenkatDatta/libvirt,shugaoye/libvirt,eskultety/libvirt,jeckersb/libvirt,rlaager/libvirt,emaste/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,elmarco/libvirt,jfehlig/libvirt,andreabolognani/libvirt,nertpinx/libvirt,elmarco/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,taget/libvirt,eskultety/libvirt,olafhering/libvirt,novel/fbsd-libvirt,cbosdo/libvirt,fabianfreyer/libvirt,agx/libvirt,siboulet/libvirt-openvz,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,shugaoye/libvirt,shugaoye/libvirt,siboulet/libvirt-openvz,iam-TJ/libvirt,novel/fbsd-libvirt,bjzhang/libvirt,bjzhang/libvirt,fabianfreyer/libvirt,jeckersb/libvirt,iam-TJ/libvirt,emaste/libvirt,datto/libvirt,novel/fbsd-libvirt,bjzhang/libvirt,jardasgit/libvirt,jardasgit/libvirt,andreabolognani/libvirt,rlaager/libvirt,taget/libvirt,siboulet/libvirt-openvz,agx/libvirt,jeckersb/libvirt,libvirt/libvirt,andreabolognani/libvirt,novel/fbsd-libvirt,zhlcindy/libvirt-1.1.4-maintain,jeckersb/libvirt,shugaoye/libvirt,emaste/libvirt,cbosdo/libvirt,novel/fbsd-libvirt,libvirt/libvirt,rlaager/libvirt,olafhering/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,siboulet/libvirt-openvz,eskultety/libvirt,novel/fbsd-libvirt,taget/libvirt,agx/libvirt,novel/fbsd-libvirt,jfehlig/libvirt,jeckersb/libvirt,VenkatDatta/libvirt,crobinso/libvirt,trainstack/libvirt,rlaager/libvirt,nertpinx/libvirt,jardasgit/libvirt,novel/fbsd-libvirt,elmarco/libvirt,iam-TJ/libvirt,crobinso/libvirt,trainstack/libvirt,emaste/libvirt,emaste/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,taget/libvirt,zippy2/libvirt,iam-TJ/libvirt,jardasgit/libvirt,cbosdo/libvirt,iam-TJ/libvirt,eskultety/libvirt,emaste/libvirt,datto/libvirt,trainstack/libvirt,nertpinx/libvirt,datto/libvirt,andreabolognani/libvirt,iam-TJ/libvirt,datto/libvirt,crobinso/libvirt,zhlcindy/libvirt-1.1.4-maintain,VenkatDatta/libvirt,bjzhang/libvirt,elmarco/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,crobinso/libvirt,rlaager/libvirt,libvirt/libvirt,jeckersb/libvirt,andreabolognani/libvirt,trainstack/libvirt,datto/libvirt,eskultety/libvirt,zippy2/libvirt,VenkatDatta/libvirt,zippy2/libvirt,olafhering/libvirt,trainstack/libvirt,cbosdo/libvirt