minor hotplug fixup

diff -u tools/examples/vif-bridge /etc/xen/scripts/vif-bridge
@@ -31,11 +31,8 @@
 # rules for its ip addresses (if any).
 #============================================================================
 
-# Exit if anything goes wrong
-set -e 
-export PATH=/sbin:/bin:/usr/bin:/usr/sbin:$PATH
-
-echo "*vif-bridge $*" >&2
+dir=$(dirname "$0")
+. "$dir/xen-hotplug-common.sh"
 
 # Operation name.
 OP=$1

diff -u tools/examples/xen-hotplug-common.sh /etc/xen/scripts/xen-hotplug-common.sh
@@ -1,6 +1,8 @@
 set -e
 
-export PATH=/sbin:/bin:/usr/bin:/usr/sbin:$PATH
+export PATH="/sbin:/bin:/usr/bin:/usr/sbin:$PATH"
+export LANG="POSIX"
+unset $(set | grep ^LC_ | cut -d= -f1)
 
 log() {
   local level="$1"