Recent OpenVZ kernels provides a 'realbtime' entry in /proc/stat
to track a HN boot time.
Fix regex to match only 'btime' entry.

Patch by Nikolay A. Fetisov

Index: fiaif-1.23.1/prog/fiaif
===================================================================
--- fiaif-1.23.1.orig/prog/fiaif	2013-01-19 18:13:19.000000000 +0100
+++ fiaif-1.23.1/prog/fiaif	2013-01-21 10:48:45.988056930 +0100
@@ -282,7 +282,7 @@ fi
 
 # Remove old state file if older than boot time
 if [[ -f ${SUBSYS_FILE} ]]; then
-    BOOT_TIME=$(grep btime /proc/stat|cut -f 2 -d" ")
+    BOOT_TIME=$(grep '^btime ' /proc/stat|cut -f 2 -d" ")
     SUBSYS_TIME=$(date +%s -r ${SUBSYS_FILE})
     if (( SUBSYS_TIME < BOOT_TIME )); then
 	rm -f ${SUBSYS_FILE}
