lxc-foreach: minor refactoring

lxc-foreach

@@ -1,10 +1,11 @@
 #!/bin/bash
 
+lxc_root=/data/containers
 for n in `lxc-ls`; do
   name=n
-  r=/data/containers/$n/rootfs
+  r=$lxc_root/$n/rootfs
   root=$r
-  c=/data/containers/$n/config
+  c=$lxc_root/$n/config
   config=$c
   eval echo "\$ $1" 1>&2
   eval "$1"