Openstack overcloud deploy fails with 'passwords'.

Issue

• When running openstack overcloud deploy the command fails immediately with:

HTTP POST https://172.26.250.244:13989/v2/action_executions 201
Starting new HTTPS connection (1): 172.26.250.244
https://172.26.250.244:13808 "GET /v1/AUTH_bf903b34410f4ed58d9f13c3bcd30708/overcloud/plan-environment.yaml HTTP/1.1" 200 233
'passwords'
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/cliff/app.py", line 400, in run_subcommand
    result = cmd.run(parsed_args)
  File "/usr/lib/python2.7/site-packages/tripleoclient/command.py", line 25, in run
    super(Command, self).run(parsed_args)
  File "/usr/lib/python2.7/site-packages/osc_lib/command/command.py", line 41, in run
    return super(Command, self).run(parsed_args)
  File "/usr/lib/python2.7/site-packages/cliff/command.py", line 184, in run
    return_code = self.take_action(parsed_args) or 0
  File "/usr/lib/python2.7/site-packages/tripleoclient/v1/overcloud_deploy.py", line 973, in take_action
    self._deploy_tripleo_heat_templates_tmpdir(stack, parsed_args)
  File "/usr/lib/python2.7/site-packages/tripleoclient/v1/overcloud_deploy.py", line 428, in _deploy_tripleo_heat_templates_tmpdir
    new_tht_root, tht_root)
  File "/usr/lib/python2.7/site-packages/tripleoclient/v1/overcloud_deploy.py", line 453, in _deploy_tripleo_heat_templates
    type(self)._keep_env_on_update)
  File "/usr/lib/python2.7/site-packages/tripleoclient/workflows/plan_management.py", line 170, in update_plan_from_templates
    passwords = _load_passwords(swift_client, name)
  File "/usr/lib/python2.7/site-packages/tripleoclient/workflows/plan_management.py", line 256, in _load_passwords
    return plan_env['passwords']
KeyError: 'passwords'
clean_up DeployOvercloud: 'passwords'