XenAPI: Fix vimrc

DevStack installs a default minimal .vimrc file for the stack user.
Unfortunately the `syntax on` config line is not recognised by the vim
installed in DomU. It results in an annoying message being displayed
whenever the user is using vi. To avoid this issue, removing the `syntax
on` line.

Change-Id: I224465cc3cdba3464ea0a9a751f250ecb6ddc9f3

Author: Mate Lakat

tools/xen/prepare_guest.sh

@@ -114,7 +114,6 @@ function setup_vimrc {
     if [ ! -e $1 ]; then
         # Simple but usable vimrc
         cat > $1 <<EOF
-syntax on
 se ts=4
 se expandtab
 se shiftwidth=4