Avoid LXC pivot root in the root source is still /
Avoid LXC pivot root in the root source is still /

If the LXC config has a filesystem

  <filesystem>
     <source dir='/'/>
     <target dir='/'/>
  </filesystem>

then there is no need to go down the pivot root codepath.
We can simply use the existing root as needed.

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

jardasgit/libvirt,rmarwaha/libvirt1,iam-TJ/libvirt,trainstack/libvirt,eskultety/libvirt,bjzhang/libvirt,fabianfreyer/libvirt,warewolf/libvirt,novel/fbsd-libvirt,cbosdo/libvirt,emaste/libvirt,wiedi/libvirt,rmarwaha/libvirt,dumbbell/libvirt,wiedi/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,fabianfreyer/libvirt,eskultety/libvirt,rmarwaha/libvirt,siboulet/libvirt-openvz,iam-TJ/libvirt,dumbbell/libvirt,fabianfreyer/libvirt,rlaager/libvirt,fabianfreyer/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,taget/libvirt,rmarwaha/libvirt1,libvirt/libvirt,nertpinx/libvirt,novel/fbsd-libvirt,siboulet/libvirt-openvz,novel/fbsd-libvirt,wiedi/libvirt,jfehlig/libvirt,elmarco/libvirt,zhlcindy/libvirt-1.1.4-maintain,warewolf/libvirt,siboulet/libvirt-openvz,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,elmarco/libvirt,nertpinx/libvirt,libvirt/libvirt,andreabolognani/libvirt,warewolf/libvirt,VenkatDatta/libvirt,zippy2/libvirt,agx/libvirt,jeckersb/libvirt,jeckersb/libvirt,shugaoye/libvirt,shugaoye/libvirt,datto/libvirt,eskultety/libvirt,datto/libvirt,crobinso/libvirt,rlaager/libvirt,VenkatDatta/libvirt,jeckersb/libvirt,jeckersb/libvirt,agx/libvirt,andreabolognani/libvirt,jfehlig/libvirt,jfehlig/libvirt,nertpinx/libvirt,shugaoye/libvirt,elmarco/libvirt,novel/fbsd-libvirt,trainstack/libvirt,cbosdo/libvirt,trainstack/libvirt,nertpinx/libvirt,andreabolognani/libvirt,wiedi/libvirt,zippy2/libvirt,zhlcindy/libvirt-1.1.4-maintain,jeckersb/libvirt,taget/libvirt,rmarwaha/libvirt1,agx/libvirt,eskultety/libvirt,libvirt/libvirt,agx/libvirt,jeckersb/libvirt,elmarco/libvirt,trainstack/libvirt,rlaager/libvirt,dumbbell/libvirt,emaste/libvirt,bjzhang/libvirt,novel/fbsd-libvirt,rmarwaha/libvirt,bjzhang/libvirt,jardasgit/libvirt,wiedi/libvirt,rmarwaha/libvirt,agx/libvirt,olafhering/libvirt,iam-TJ/libvirt,crobinso/libvirt,iam-TJ/libvirt,bjzhang/libvirt,rmarwaha/libvirt,shugaoye/libvirt,eskultety/libvirt,novel/fbsd-libvirt,dumbbell/libvirt,crobinso/libvirt,wiedi/libvirt,rmarwaha/libvirt1,iam-TJ/libvirt,libvirt/libvirt,crobinso/libvirt,novel/fbsd-libvirt,emaste/libvirt,jardasgit/libvirt,rlaager/libvirt,emaste/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,rmarwaha/libvirt1,emaste/libvirt,warewolf/libvirt,datto/libvirt,datto/libvirt,emaste/libvirt,cbosdo/libvirt,iam-TJ/libvirt,bjzhang/libvirt,wiedi/libvirt,dumbbell/libvirt,olafhering/libvirt,warewolf/libvirt,jardasgit/libvirt,siboulet/libvirt-openvz,jardasgit/libvirt,olafhering/libvirt,trainstack/libvirt,iam-TJ/libvirt,rmarwaha/libvirt,nertpinx/libvirt,rlaager/libvirt,emaste/libvirt,datto/libvirt,novel/fbsd-libvirt,zippy2/libvirt,jeckersb/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,warewolf/libvirt,olafhering/libvirt,trainstack/libvirt,dumbbell/libvirt,zippy2/libvirt,siboulet/libvirt-openvz,cbosdo/libvirt,rmarwaha/libvirt1,taget/libvirt,elmarco/libvirt,andreabolognani/libvirt,warewolf/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,novel/fbsd-libvirt,trainstack/libvirt