ntp_client: Add maxdelay on ntp pool in chrony.conf

By defaul is chrony getting ntp servers around the world.
The default maxdelay value is 3 seconds and the maximum value is 1000 seconds.

tests/console/ntp_client.pm

@@ -38,6 +38,9 @@ sub run {
     systemctl 'is-active systemd-timesyncd',  expect_false => 1;
     systemctl 'is-enabled systemd-timesyncd', expect_false => 1;
 
+    # add maxdelay option on pool to get close and fast ntp servers
+    assert_script_run q(sed -i '/iburst/ s/$/ maxdelay 0.3/' /etc/chrony.conf);
+
     # ensure that chronyd is running
     systemctl 'is-enabled chronyd';
     systemctl 'is-active chronyd';