parallels: Remove unused JSON fetch of "OS"
parallels: Remove unused JSON fetch of "OS"

Commit id ac1c77f0 removed the "os" field in "parallelsDomObj" that
commit id aa296e6c had added and the data is not used by the function.

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