OSP16 overcloud deployment failed at TASK [Ensure system is NTP time synced]

Issue

• Deploy osp16 overcloud using director's br-ctlplane IP as ntp server failed at TASK [Ensure system is NTP time synced]:

2020-04-27 04:54:25.956 15337 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] TASK [Ensure system is NTP time synced] **********************************
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2020-04-27 04:54:25.956 15337 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] Monday 27 April 2020  04:54:25 -0400 (0:00:00.665)       0:03:53.339 *****
*****
2020-04-27 04:57:36.359 15337 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] fatal: [instack]: FAILED! => {"changed": true, "cmd": ["chronyc", "waitsyn
c", "20"], "delta": "0:03:10.144000", "end": "2020-04-27 04:57:36.310215", "msg": "non-zero return code", "rc": 1, "start": "2020-04-27 04:54:26.166215", "s
tderr": "", "stderr_lines": [], "stdout": "try: 1, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 2, refid: 00000000, correction: 0.000000000, 
skew: 0.000\ntry: 3, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 4, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 5, refid: 00
000000, correction: 0.000000000, skew: 0.000\ntry: 6, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 7, refid: 00000000, correction: 0.00000000
0, skew: 0.000\ntry: 8, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 9, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 10, refid
: 00000000, correction: 0.000000000, skew: 0.000\ntry: 11, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 12, refid: 00000000, correction: 0.00
0000000, skew: 0.000\ntry: 13, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 14, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 1
5, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 16, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 17, refid: 00000000, correcti
on: 0.000000000, skew: 0.000\ntry: 18, refid: 00000000, correction: 0.000000000, skew: 0.000\ntry: 19, refid: 00000000, correction: 0.000000000, skew: 0.000
\ntry: 20, refid: 00000000, correction: 0.000000000, skew: 0.000", "stdout_lines": ["try: 1, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 2
, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 3, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 4, refid: 00000000, correct
ion: 0.000000000, skew: 0.000", "try: 5, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 6, refid: 00000000, correction: 0.000000000, skew: 0.
000", "try: 7, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 8, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 9, refid: 0000
0000, correction: 0.000000000, skew: 0.000", "try: 10, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 11, refid: 00000000, correction: 0.0000
00000, skew: 0.000", "try: 12, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 13, refid: 00000000, correction: 0.000000000, skew: 0.000", "tr
y: 14, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 15, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 16, refid: 00000000, 
correction: 0.000000000, skew: 0.000", "try: 17, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 18, refid: 00000000, correction: 0.000000000,
 skew: 0.000", "try: 19, refid: 00000000, correction: 0.000000000, skew: 0.000", "try: 20, refid: 00000000, correction: 0.000000000, skew: 0.000"]}
2020-04-27 04:57:36.359 15337 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2020-04-27 04:57:36.359 15337 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] NO MORE HOSTS LEFT *******************************************************
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2020-04-27 04:57:36.360 15337 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2020-04-27 04:57:36.360 15337 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] PLAY RECAP ***************************************************************
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2020-04-27 04:57:36.360 15337 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] instack                    : ok=181  changed=121  unreachable=0    failed=
1    skipped=27   rescued=0    ignored=2