Increase retention period for CommModule logfiles to at least 2.5 years

in accordance with Security Manual 4.2.1 (at least 24/at most 36 months).

CommModule/logclean.sh

@@ -46,8 +46,8 @@ then
 	done
 fi
 
-# delete old logfiles which have not been modified in at least one year
-FILES=`find oldlogs/logfile20*.txt.bz2 -mtime +365 -print`
+# delete old logfiles which have not been modified in at least 2.5+ years
+FILES=`find oldlogs/logfile20*.txt.bz2 -mtime +913 -print`
 if [ -n "${FILES}" ]
 then
 	for F in ${FILES}