Speed up containers creation by removing unneded rsync call from lxc-template

Was able to drop project's "/example" `vagrant up` from 42s down to 29s

Closes #40

boxes/quantal64/lxc-template

@@ -161,8 +161,8 @@ copy_ubuntu()
 
     # make a local copy of the miniubuntu
     echo "Copying rootfs to $rootfs ..."
-    mkdir -p $rootfs
-    rsync -a $cache/rootfs-$arch/ $rootfs/ || return 1
+    mkdir -p $(dirname $rootfs)
+    mv $cache/rootfs-$arch $rootfs || return 1
     return 0
 }