Updating Red Hat OpenStack Platform on 16.1.X failed in an offline repository environment

Issue

• An offline package repository are used.

• openstack overcloud update run failed with the following error message.

  ERROR osc_lib.shell [-] Traceback (most recent call last):
    File "/usr/lib/python3.6/site-packages/osc_lib/shell.py", line 136, in run
      ret_val = super(OpenStackShell, self).run(argv)
    File "/usr/lib/python3.6/site-packages/cliff/app.py", line 281, in run
      result = self.run_subcommand(remainder)
    File "/usr/lib/python3.6/site-packages/osc_lib/shell.py", line 176, in run_subcommand
      ret_value = super(OpenStackShell, self).run_subcommand(argv)
    File "/usr/lib/python3.6/site-packages/cliff/app.py", line 401, in run_subcommand
      result = cmd.run(parsed_args)
    File "/usr/lib/python3.6/site-packages/tripleoclient/command.py", line 32, in run
      super(Command, self).run(parsed_args)
    File "/usr/lib/python3.6/site-packages/osc_lib/command/command.py", line 41, in run
      return super(Command, self).run(parsed_args)
    File "/usr/lib/python3.6/site-packages/cliff/command.py", line 185, in run
      return_code = self.take_action(parsed_args) or 0
    File "/usr/lib/python3.6/site-packages/tripleoclient/v1/overcloud_update.py", line 219, in take_action
      priv_key=key)
    File "/usr/lib/python3.6/site-packages/tripleoclient/utils.py", line 1409, in run_update_ansible_action
      verbosity=verbosity, extra_vars=extra_vars)
    File "/usr/lib/python3.6/site-packages/tripleoclient/workflows/package_update.py", line 127, in update_ansible
      raise RuntimeError('Update failed with: {}'.format(payload['message']))
  RuntimeError: Update failed with: Ansible failed, check log at /var/log/containers/mistral/package_update.log.
  : RuntimeError: Update failed with: Ansible failed, check log at /var/log/containers/mistral/package_update.log.
  INFO osc_lib.shell [-] END return value: 1
  

• /var/log/containers/mistral/package_update.log indicates that Wait for containers to start for step 2 using paunch task failed.

  TASK [Wait for containers to start for step 2 using paunch] ********************
    :
    : (...omitted...)
    :
  p=137306 u=mistral n=ansible | fatal: [controller-0]: FAILED! => {
      "ansible_job_id": "XXXXXXXXXX.XXXXX",
      "attempts": 1200,
      "changed": false,
      "finished": 0,
      "invocation": {
          "module_args": {
              "_async_dir": "/root/.ansible_async",
              "jid": "XXXXXXXXXX.XXXXX",
              "mode": "status"
          }
      },
      "started": 1
  }