CA-35881: mkdir /var/log/blktap during boot.

Logrotate requires at least the search path to exist. If that fails,
Xapi tends to flood xensource.log with error messages over time.

Signed-off-by: Daniel Stodden <daniel.stodden@xxxxxxxxxx>

diff -r 9b1f5588c72c -r 3424887e87d5 scripts/init.d-xenservices
--- a/scripts/init.d-xenservices	Mon Dec 14 11:29:31 2009 -0800
+++ b/scripts/init.d-xenservices	Mon Dec 14 11:33:38 2009 -0800
@@ -62,6 +62,7 @@
 
 	/usr/sbin/xenconsoled
 	/usr/sbin/blktapctrl
+	[ -d /var/log/blktap ] || mkdir /var/log/blktap
 	
 	# Delete rubbish from xapi's private tree in xenstore, once per boot (not once per
 	# xapi invocation since the data should be persistent across xapi restarts)