pv_ops/dom0 kernel has xenfs -> mount it if needed.

--- a/tools/examples/init.d/xenstored.orig	2009-02-26 16:01:57.000000000 +0100
+++ b/tools/examples/init.d/xenstored	2009-02-26 16:03:20.000000000 +0100
@@ -25,6 +25,9 @@
 if [ ! -d /proc/xen ]; then
 	exit 0
 fi
+if [ ! -f /proc/xen/capabilities ]; then
+	mount -t xenfs xen /proc/xen
+fi
 if ! grep -q "control_d" /proc/xen/capabilities ; then
 	exit 0
 fi
@@ -38,6 +41,7 @@ test -f /etc/sysconfig/xenstored && . /e
 
 start() {
 	echo -n $"Starting xenstored daemon: "
+	rm -f /var/lib/xenstored/tdb
         /usr/sbin/xenstored --pid-file $XENSTORED_PID $XENSTORED_ARGS
 	RETVAL=$?
 	test $RETVAL = 0 && echo_success || echo_failure