Fix for nwfilter: Add filter schema for nwfilter XML, extend domain XML schema
Fix for nwfilter: Add filter schema for nwfilter XML, extend domain XML schema

Fixing the regular expressions for variables where the first letter must be a $.

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