horizon loads wrong local_settings.py file in ubuntu-binary-rocky deployment

[Zap Chang]

## How to reproduce

- Use following kolla-ansible config to deploy a ubuntu-binary all-in-one deployment:

```
# Valid options are ['centos', 'debian', 'oraclelinux', 'rhel', 'ubuntu']
kolla_base_distro: "ubuntu"

# Valid options are [ binary, source ]
kolla_install_type: "binary"

# Valid option is Docker repository tag
openstack_release: "rocky"
```

- When deployment is complete, load horizon front page and got a page not found error.

## Some thoughts

- When opening horizon front page. Browser redirects to `http://<vip>/horizon/auth/login/?next=/`, `horizon` should not be included.
- Remove `horizon` in the URL, we can see the login page. but static files can not be loaded.
- Use docker exec to view horizon container's config, turns out that `local_settings.py` is not link to local_settings. Horizon loads the config from ubuntu `openstack-dashboard` package rather than the generated one from kolla-ansible.

  ```
  (horizon)[root@host /]# ll /etc/openstack-dashboard/local_settings*
  -rw------- 1 horizon horizon 29538 Nov 12 09:48 /etc/openstack-dashboard/local_settings
  -rw-r----- 1 root horizon 33982 Nov 11 07:31 /etc/openstack-dashboard/local_settings.py
  ```

- My current workaround is
  - Add `rm /etc/openstack-dashboard/local_settings.py` line back in horizon's Dockerfile. (Removed
 by commit https://github.com/openstack/kolla/commit/1cde66e4d74f981253869b85d3fdce6baa92008e#diff-013ae98a8669cfbe8ae3b1f096e38e39 )
  - Create symbolic link from `local_settings.py` to `local_settings` in `extend_start.sh`

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/668409

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/668410

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/668409
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=eb7c730e057082eadab5c01ef845f65bb5cf47c4
Submitter: Zuul
Branch: master

commit eb7c730e057082eadab5c01ef845f65bb5cf47c4
Author: Dincer Celik <email address hidden>
Date: Mon Jul 1 13:18:36 2019 +0300

    Fixes wrong local_setting.py file issue for Ubuntu binary deployment.

    This bug both affects Rocky and Stein. local_setting.py was not
    linked to local_settings under /etc/openstack-dashboard so Horizon
    runs with default settings.

    Change-Id: I818876619694695663c98d9edcb8c8514198e8fd
    Closes-Bug: #1803029

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/668410
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=120e8080ab57d79a7ae4b51d3215b98222aab29e
Submitter: Zuul
Branch: master

commit 120e8080ab57d79a7ae4b51d3215b98222aab29e
Author: Dincer Celik <email address hidden>
Date: Mon Jul 1 13:25:49 2019 +0300

    Fix import of horizon custom_local_settings on python3

    Change-Id: I71f3e8ab50426246b595755a8f3298ba7ca0a50d
    Closes-Bug: #1803029

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/stein
Review: https://review.opendev.org/677675

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/stein
Review: https://review.opendev.org/677679

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/rocky
Review: https://review.opendev.org/677680

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/677675
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=25c9d10cdd06074786840bca2698239b6c9711c6
Submitter: Zuul
Branch: stable/stein

commit 25c9d10cdd06074786840bca2698239b6c9711c6
Author: Dincer Celik <email address hidden>
Date: Mon Jul 1 13:25:49 2019 +0300

    Fix import of horizon custom_local_settings on python3

    Change-Id: I71f3e8ab50426246b595755a8f3298ba7ca0a50d
    Closes-Bug: #1803029
    (cherry picked from commit 120e8080ab57d79a7ae4b51d3215b98222aab29e)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/677679
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=510c2d8f9583970a48fd1d66cfa4d00e0395a0c7
Submitter: Zuul
Branch: stable/stein

commit 510c2d8f9583970a48fd1d66cfa4d00e0395a0c7
Author: Dincer Celik <email address hidden>
Date: Mon Jul 1 13:18:36 2019 +0300

    Fixes wrong local_setting.py file issue for Ubuntu binary deployment.

    This bug both affects Rocky and Stein. local_setting.py was not
    linked to local_settings under /etc/openstack-dashboard so Horizon
    runs with default settings.

    Change-Id: I818876619694695663c98d9edcb8c8514198e8fd
    Closes-Bug: #1803029
    (cherry picked from commit eb7c730e057082eadab5c01ef845f65bb5cf47c4)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/677680
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=f3331fcd2dca8baaab5afeaaa6d251304dba1dbc
Submitter: Zuul
Branch: stable/rocky

commit f3331fcd2dca8baaab5afeaaa6d251304dba1dbc
Author: Dincer Celik <email address hidden>
Date: Mon Jul 1 13:18:36 2019 +0300

    Fixes wrong local_setting.py file issue for Ubuntu binary deployment.

    This bug both affects Rocky and Stein. local_setting.py was not
    linked to local_settings under /etc/openstack-dashboard so Horizon
    runs with default settings.

    Change-Id: I818876619694695663c98d9edcb8c8514198e8fd
    Closes-Bug: #1803029
    (cherry picked from commit eb7c730e057082eadab5c01ef845f65bb5cf47c4)

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla 7.0.4 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla-ansible 8.0.1 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla 8.0.1 release.

[OpenStack Infra (hudson-openstack)]

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

[OpenStack Infra (hudson-openstack)]

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