test: try fix etcd error in CI

tests/_utils/shardddl_lib.sh

@@ -47,8 +47,9 @@ function clean_table() {
 
 function restart_master() {
 	echo "restart dm-master"
-	wait_process_exit dm-master.test
+	ps aux | grep dm-master | awk '{print $2}' | xargs kill || true
 	check_port_offline $MASTER_PORT 20
+	sleep 2
 
 	run_dm_master $WORK_DIR/master $MASTER_PORT $cur/conf/dm-master.toml
 	check_rpc_alive $cur/../bin/check_master_online 127.0.0.1:$MASTER_PORT

tests/_utils/wait_process_exit

@@ -1,29 +1,20 @@
 #!/bin/bash
 # parameter 1: process name
-process=$1
-
-PID=$(pgrep $process)
-if [ -z "$PID" ]; then
-	echo "process $process already exit"
-	exit
-fi
 
-WAIT_COUNT=10
-KILL_TIMES=1 # make sure only send kill -9 once.
-count=0
+process=$1
 
-while true; do
+WAIT_COUNT=0
+while [ $WAIT_COUNT -lt 30 ]; do
 	pgrep $process >/dev/null 2>&1
 	ret=$?
 	if [ "$ret" != "0" ]; then
 		echo "process $process already exit"
-		break
+		exit 0
 	fi
-	sleep 0.2
-	((count++))
+	sleep 1
 	echo "wait process $process exit..."
-	if [ $count -gt $WAIT_COUNT ] && [ $KILL_TIMES -lt 2 ]; then
-		((KILL_TIMES++))
-		kill -9 $PID || true
-	fi
+	((WAIT_COUNT++))
 done
+
+echo "process $process didn't exit after 30 seconds"
+exit 1