schema: Add graphics element passwdValidTo attribute to schema
schema: Add graphics element passwdValidTo attribute to schema

We support this in code, but forgot to add this to RNG schema as well.
According to documentation, the value match the dateTime type.

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