Comment 10 for bug 1634340

hi Sihan:
 the snapshot create use vcenter,because customer use third product to backup vm.
 the third backup product is to crate snapshot and then backup .
 so when the vm has snapshot,the openstack get the root device will get error.and then ,i add :
                 if root_disk and (path.basename == root_disk + ".vmdk"
                                  or
                                  path.basename.startswith(root_disk + "-")):
 then this code will good whether or not has snapshot!

 thanks!