All clients used by Magnum should use internalURL

[Bharat Kunwar]

At present, some clients in Magnum are configured to use internalURL and others that are not configured use publicURL by default. All control plane communications should happen via internalURL otherwise it leads to inconsistencies. For example, if the publicURL requires self signed CA file, Magnum fails to communicated with Octavia client during cluster deletion with an error like this in the conductor:

```
Failed to pre-delete resources for cluster 0e96adc8-2f1a-4c0b-8d6f-8603044aafc6, error: SSL exception connecting to https://os.dl.hpc.tuwien.ac.at:9876/v2.0/lbaas/loadbalancers: HTTPSConnectionPool(host='os.dl.hpc.tuwien.ac.at', port=9876): Max retries exceeded with url: /v2.0/lbaas/loadbalancers (Caused by SSLError(SSLError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:897)'),)).
```

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/737834
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=eb24945d75379952d0988403f3ed4bb9203f2113
Submitter: Zuul
Branch: master

commit eb24945d75379952d0988403f3ed4bb9203f2113
Author: Bharat Kunwar <email address hidden>
Date: Wed Jun 24 16:24:30 2020 +0100

    Use internalURL endpoint_type for all clients used by Magnum

    Magnum, Cinder and Octavia clients in Magnum now use endpoint_type of
    internalURL by default consistent with other clients also used by the
    conductor. Additionally, they also use the globally defined
    `openstack_region_name` for region_name.

    Closes-Bug: #1885096

    Change-Id: Ibec511013760cc4f681a2ec1b769b532be3daf2d

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/ussuri
Review: https://review.opendev.org/738252

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/train
Review: https://review.opendev.org/738253

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/stein
Review: https://review.opendev.org/738341

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/738252
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=a0a184e95478950ee4e7b081bbed12f8b203d092
Submitter: Zuul
Branch: stable/ussuri

commit a0a184e95478950ee4e7b081bbed12f8b203d092
Author: Bharat Kunwar <email address hidden>
Date: Wed Jun 24 16:24:30 2020 +0100

    Use internalURL endpoint_type for all clients used by Magnum

    Magnum, Cinder and Octavia clients in Magnum now use endpoint_type of
    internalURL by default consistent with other clients also used by the
    conductor. Additionally, they also use the globally defined
    `openstack_region_name` for region_name.

    Closes-Bug: #1885096

    Change-Id: Ibec511013760cc4f681a2ec1b769b532be3daf2d
    (cherry picked from commit eb24945d75379952d0988403f3ed4bb9203f2113)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/738253
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=1aa4565ff3050aacfa9c048ae152178cb635169b
Submitter: Zuul
Branch: stable/train

commit 1aa4565ff3050aacfa9c048ae152178cb635169b
Author: Bharat Kunwar <email address hidden>
Date: Wed Jun 24 16:24:30 2020 +0100

    Use internalURL endpoint_type for all clients used by Magnum

    Magnum, Cinder and Octavia clients in Magnum now use endpoint_type of
    internalURL by default consistent with other clients also used by the
    conductor. Additionally, they also use the globally defined
    `openstack_region_name` for region_name.

    Closes-Bug: #1885096

    Change-Id: Ibec511013760cc4f681a2ec1b769b532be3daf2d
    (cherry picked from commit eb24945d75379952d0988403f3ed4bb9203f2113)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/738341
Committed: https://git.openstack.org/cgit/openstack/kolla-ansible/commit/?id=c19169679a284ce10db304c68a6a60f45562b510
Submitter: Zuul
Branch: stable/stein

commit c19169679a284ce10db304c68a6a60f45562b510
Author: Bharat Kunwar <email address hidden>
Date: Wed Jun 24 16:24:30 2020 +0100

    Use internalURL endpoint_type for all clients used by Magnum

    Magnum, Cinder and Octavia clients in Magnum now use endpoint_type of
    internalURL by default consistent with other clients also used by the
    conductor. Additionally, they also use the globally defined
    `openstack_region_name` for region_name.

    Closes-Bug: #1885096

    Change-Id: Ibec511013760cc4f681a2ec1b769b532be3daf2d
    (cherry picked from commit eb24945d75379952d0988403f3ed4bb9203f2113)