mwan3: be more efficient with sleep after killing trackers

Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>
(cherry picked from commit 84a53b7c79)

net/mwan3/files/lib/mwan3/mwan3.sh

@@ -672,7 +672,9 @@ mwan3_track()
 
 	for pid in $(pgrep -f "mwan3track $1 $2"); do
 		kill -TERM "$pid" > /dev/null 2>&1
+	done
 	sleep 1
+	for pid in $(pgrep -f "mwan3track $1 $2"); do
 		kill -KILL "$pid" > /dev/null 2>&1
 	done
 	if [ -n "$track_ips" ]; then

net/mwan3/files/usr/sbin/mwan3

@@ -141,13 +141,19 @@ stop()
 
 	for pid in $(pgrep -f "mwan3rtmon"); do
 		kill -TERM "$pid" > /dev/null 2>&1
-		sleep 1
-		kill -KILL "$pid" > /dev/null 2>&1
 	done
 
 	for pid in $(pgrep -f "mwan3track"); do
 		kill -TERM "$pid" > /dev/null 2>&1
+	done
+
 	sleep 1
+
+	for pid in $(pgrep -f "mwan3rtmon"); do
+		kill -KILL "$pid" > /dev/null 2>&1
+	done
+
+	for pid in $(pgrep -f "mwan3track"); do
 		kill -KILL "$pid" > /dev/null 2>&1
 	done