missing rsync package causes undercloud deployment to fail.

Environment:
python3-tripleoclient-11.5.1-0.20190731190514.55fe384.el8ost.noarch

Steps to reproduce:
Attempt to deploy undercloud on rhel without rsync package.

Result:
The undercloud deployment fails with:

2019-08-06 23:44:46.178 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2019-08-06 23:44:46.179 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] TASK [Create puppet caching structures] ****************************************
2019-08-06 23:44:46.564 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] changed: [undercloud]
2019-08-06 23:44:46.665 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2019-08-06 23:44:46.665 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] TASK [Write facter cache config] ***********************************************
2019-08-06 23:44:47.395 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] changed: [undercloud]
2019-08-06 23:44:47.493 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2019-08-06 23:44:47.493 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] TASK [Cleanup facter cache if exists] ******************************************
2019-08-06 23:44:47.850 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] ok: [undercloud]
2019-08-06 23:44:47.949 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2019-08-06 23:44:47.949 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] TASK [Pre-cache facts] *********************************************************
2019-08-06 23:44:48.809 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] changed: [undercloud]
2019-08-06 23:44:49.014 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2019-08-06 23:44:49.014 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] TASK [Sync cached facts] *******************************************************
2019-08-06 23:44:49.810 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] fatal: [undercloud -> 192.168.0.1]: FAILED! => {"changed": false, "msg": "Failed to find required executable rsync in paths: /sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin"}
2019-08-06 23:44:49.813 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2019-08-06 23:44:49.814 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] NO MORE HOSTS LEFT *************************************************************
2019-08-06 23:44:49.817 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2019-08-06 23:44:49.817 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] PLAY RECAP *********************************************************************
2019-08-06 23:44:49.817 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] undercloud                 : ok=252  changed=157  unreachable=0    failed=1    skipped=174  rescued=0    ignored=2
2019-08-06 23:44:49.817 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] 
2019-08-06 23:44:50.063 29098 ERROR tripleoclient.v1.tripleo_deploy.Deploy [  ] Exception: Deployment failed
2019-08-06 23:44:50.067 29098 ERROR tripleoclient.v1.tripleo_deploy.Deploy [  ] None
2019-08-06 23:44:51.795 29098 ERROR tripleoclient.v1.tripleo_deploy.Deploy [  ] ** Found ansible errors for undercloud deployment! **
2019-08-06 23:44:51.796 29098 ERROR tripleoclient.v1.tripleo_deploy.Deploy [  ] [
 [
  "Sync cached facts",
  {
   "msg": "Failed to find required executable rsync in paths: /sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin",
   "invocation": {
    "module_args": {
     "src": "/opt/puppetlabs/",
     "dest": "/var/lib/container-puppet/puppetlabs/",
     "_local_rsync_path": "rsync",
     "_local_rsync_password": null,
     "rsync_path": null,
     "delete": false,
     "_substitute_controller": false,
     "archive": true,
     "checksum": false,
     "compress": true,
     "existing_only": false,
     "dirs": false,
     "copy_links": false,
     "set_remote_user": true,
     "rsync_timeout": 0,
     "rsync_opts": [],
     "partial": false,
     "verify_host": false,
     "mode": "push",
     "dest_port": null,
     "private_key": null,
     "recursive": null,
     "links": null,
     "perms": null,
     "times": null,
     "owner": null,
     "group": null,
     "ssh_args": null,
     "link_dest": null
    }
   },
   "_ansible_no_log": false,
   "changed": false,
   "_ansible_delegated_vars": {
    "ansible_host": "192.168.0.1"
   }
  }
 ]
]
2019-08-06 23:44:51.880 29098 WARNING tripleoclient.v1.tripleo_deploy.Deploy [  ] Install artifact is located at /home/stack/undercloud-install-20190806204450.tar.bzip2
2019-08-06 23:44:51.881 29098 ERROR tripleoclient.v1.tripleo_deploy.Deploy [  ] 
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Deployment Failed!

ERROR: Heat log files: /var/log/heat-launcher/undercloud_deploy-4q9r2cvp

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2019-08-06 23:44:51.881 29098 ERROR openstack [  ] Deployment failed.
2019-08-06 23:44:52.161 28765 ERROR tripleoclient.v1.undercloud.InstallUndercloud [  ] 
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

An error has occured while deploying the Undercloud.

See the previous output for details about what went wrong.

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

2019-08-06 23:44:52.163 28765 ERROR tripleoclient.v1.undercloud.InstallUndercloud [  ] Command '['sudo', '--preserve-env', 'openstack', 'tripleo', 'deploy', '--standalone', '--standalone-role', 'Undercloud', '--stack', 'undercloud', '--local-domain=localdomain', '--local-ip=192.168.0.1/24', '--templates=/usr/share/openstack-tripleo-heat-templates/', '--networks-file=network_data_undercloud.yaml', '--heat-native', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/undercloud.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/use-dns-for-vips.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/podman.yaml', '-e', '/home/stack/containers-prepare-parameter.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/masquerade-networks.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/ironic.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/ironic-inspector.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/mistral.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/zaqar-swift-backend.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/tripleo-ui.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/tempest.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/public-tls-undercloud.yaml', '--public-virtual-ip', '192.168.0.2', '--control-virtual-ip', '192.168.0.3', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/ssl/tls-endpoints-public-ip.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/undercloud-haproxy.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/services/undercloud-keepalived.yaml', '--deployment-user', 'stack', '--output-dir=/home/stack', '--cleanup', '-e', '/home/stack/tripleo-config-generated-env-files/undercloud_parameters.yaml', '-e', '/usr/share/openstack-tripleo-heat-templates/environments/tripleo-validations.yaml', '--log-file=install-undercloud.log', '-e', '/usr/share/openstack-tripleo-heat-templates/undercloud-stack-vstate-dropin.yaml']' returned non-zero exit status 1.



Workaround:
yum install -y rsync


and re-deploy undercloud.