Renaming payload fails for Fluentd Monasca config

[Doug Szumski]

In 00-record-transformer.conf the following snippet is used to rename the `Payload` field to `message` for the Fluentd Monasca output plugin:

```
<filter *.**>
  @type record_transformer
  #enable_ruby true
  <record>
    message ${record["Payload"]}
  </record>
  remove_keys Payload
</filter>
```

The problem is that when the `Payload` key is removed, the `message` field is also removed, likely due to a shallow copy. If the line to remove the `Payload` field is removed, the `message` field is send to Monasca with the contents of the log message, as expected, however it also contains the `Payload` field.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/660990

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/stein
Review: https://review.opendev.org/661018

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/rocky
Review: https://review.opendev.org/661025

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/661018
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=a5cd622396700ff995d5fa7f70ff5bdeb2156013
Submitter: Zuul
Branch: stable/stein

commit a5cd622396700ff995d5fa7f70ff5bdeb2156013
Author: Doug Szumski <email address hidden>
Date: Thu May 23 12:03:14 2019 +0100

    Set log message field name in Monasca Fluentd plugin

    Let the Monasca Fluentd output plugin handle mapping of the log
    message.

    Change-Id: I4a74a91b9b38d5c172397a7e7204e626bcedcfac
    Closes-Bug: #1830184
    Depends-On: https://review.opendev.org/#/c/660988/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/661025
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=2ee13e179ffdac4ddc199e2d4d35ef8b18fcfb29
Submitter: Zuul
Branch: stable/rocky

commit 2ee13e179ffdac4ddc199e2d4d35ef8b18fcfb29
Author: Doug Szumski <email address hidden>
Date: Thu May 23 12:03:14 2019 +0100

    Set log message field name in Monasca Fluentd plugin

    Let the Monasca Fluentd output plugin handle mapping of the log
    message.

    Change-Id: I4a74a91b9b38d5c172397a7e7204e626bcedcfac
    Closes-Bug: #1830184
    Depends-On: https://review.opendev.org/#/c/660988/
    (cherry picked from commit a5cd622396700ff995d5fa7f70ff5bdeb2156013)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/660990
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=0351ec2e626301ce8bc9970a8da9bdf8bc7616d9
Submitter: Zuul
Branch: master

commit 0351ec2e626301ce8bc9970a8da9bdf8bc7616d9
Author: Doug Szumski <email address hidden>
Date: Thu May 23 12:03:14 2019 +0100

    Set log message field name in Monasca Fluentd plugin

    Let the Monasca Fluentd output plugin handle mapping of the log
    message.

    Change-Id: I4a74a91b9b38d5c172397a7e7204e626bcedcfac
    Closes-Bug: #1830184
    Depends-On: https://review.opendev.org/#/c/660988/

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla-ansible 7.1.1 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla-ansible 8.0.0.0rc2 release candidate.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla-ansible 9.0.0.0rc1 release candidate.