xend: Address some Coverity false positives
xend: Address some Coverity false positives

The various _for_i loops with both u.s.car and u.s.cdr were being reported
as COPY_PASTE errors by Coverity.  This just quiets those messages.

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