qemu: Don't change ownership of file when appending to it
qemu: Don't change ownership of file when appending to it

Saving domain to previously created file changes also its ownership.
This is certainly not what users want if some conditions are met:
it is a regular, local file and dynamic_ownership is off.

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