Remove cloning of devstack

Now that we have split the scripts, we should not clone devstack.
We now require users to copy the xva over.

Change-Id: Ie7cb4858c3e5860ab5c990c5ed1f88462c6953dd
diff --git a/tools/xen/prepare_dom0.sh b/tools/xen/prepare_dom0.sh
index ce16ada..a8381ab 100755
--- a/tools/xen/prepare_dom0.sh
+++ b/tools/xen/prepare_dom0.sh
@@ -34,8 +34,3 @@
     make install
 fi
 
-# Clone devstack
-DEVSTACK=/root/devstack
-if [ ! -d $DEVSTACK ]; then
-    git clone git://github.com/cloudbuilders/devstack.git $DEVSTACK
-fi