debug: add sleep after reboot

Author: HuijingHei

mantle/kola/tests/ostree/sync.go

@@ -157,7 +157,7 @@ storage:
       contents:
         inline: |
           [Manager]
-          DefaultTimeoutStopSec=5s
+          DefaultTimeoutStopSec=10s
     - path: /usr/local/bin/nfs-random-write.sh
       mode: 0755
       overwrite: true
@@ -229,14 +229,15 @@ func doSyncTest(c cluster.TestCluster, client platform.Machine) {
 	}
 	c.Log("Set link down and rebooting.")
 	// Skip the error check as it is expected
-	cmd := fmt.Sprintf("sudo systemd-run sh -c 'ip link set %s down && sleep 5 && systemctl reboot'", netdevice)
+	cmd := fmt.Sprintf("sudo systemd-run sh -c 'ip link set %s down && sleep 2 && systemctl reboot'", netdevice)
 	_, _ = c.SSH(client, cmd)
 
+	time.Sleep(10 * time.Second)
 	err = util.Retry(8, 10*time.Second, func() error {
 		// Look for the kernel argument test=1
 		kernelArguments, err := c.SSH(client, "cat /proc/cmdline")
 		if err != nil {
-			return fmt.Errorf("failed to read /proc/cmdline: %w", err)
+			return err
 		} else if !strings.Contains(string(kernelArguments), "test=1") {
 			c.Fatalf("Not found test=1 in kernel argument after rebooted")
 		}