xenapi: Use C locale

By exporting the LC_ALL=C we can get rid of localisation issues, as the
actual scripts are already assuming an english installation.

FIxes bug 1227527

Change-Id: Ieeebce4d53b09959146a970f3fb803201ac5ebdf
diff --git a/tools/xen/install_os_domU.sh b/tools/xen/install_os_domU.sh
index b49504d..110bbd9 100755
--- a/tools/xen/install_os_domU.sh
+++ b/tools/xen/install_os_domU.sh
@@ -10,6 +10,8 @@
 set -o nounset
 set -o xtrace
 
+export LC_ALL=C
+
 # Abort if localrc is not set
 if [ ! -e ../../localrc ]; then
     echo "You must have a localrc with ALL necessary passwords defined before proceeding."