kamctl: stats command can print a single group of statistics

- groupid can be given as command parameter

utils/kamctl/kamctl

@@ -2548,7 +2548,11 @@ case $1 in
 
 	stats)
 		require_ctlengine
-		$CTLCMD get_statistics all
+		if [ "$#" -eq 1 ] ; then
+			$CTLCMD get_statistics all
+		else
+			$CTLCMD get_statistics "${2}:"
+		fi
 		;;
 
 	restart)

utils/kamctl/kamctl.ctlbase

@@ -93,7 +93,7 @@ EOF
 	mecho " -- command 'stats' - print internal statistics"
 	echo
 cat <<EOF
- stats .............................. dump all internall statistics
+ stats [group]....................... dump all or a group of internall statistics
 EOF
 }
 USAGE_FUNCTIONS="$USAGE_FUNCTIONS usage_ctlcommon"