Add while/until to the for/do rule

Like 'for/do' check that the while/until operator are on
the same line with the do.

Fixes some pep8 error along the way.

Change-Id: I440afe60691263365bf35310bf4212d94f30c339
diff --git a/tools/xen/install_os_domU.sh b/tools/xen/install_os_domU.sh
index d172c7b..d0d81a2 100755
--- a/tools/xen/install_os_domU.sh
+++ b/tools/xen/install_os_domU.sh
@@ -191,8 +191,7 @@
     domid=$(xe vm-list name-label="$GUEST_NAME" params=dom-id minimal=true)
     port=$(xenstore-read /local/domain/$domid/console/vnc-port)
     echo "vncviewer -via root@$mgmt_ip localhost:${port:2}"
-    while true
-    do
+    while true; do
         state=$(xe_min vm-list name-label="$GUEST_NAME" power-state=halted)
         if [ -n "$state" ]; then
             break