use external_openstack_lbaas_use_octavia for template openstack-cloud…

[metanovii]

external_openstack_lbaas_use_octavia defined in roles/kubespray-defaults/defaults/main.yaml but not using

What type of PR is this?
/kind bug

What this PR does / why we need it:
In my case config must be like this

[LoadBalancer]
...
lb-provider=amphora
use-octavia=true

Which issue(s) this PR fixes:
Without issue

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

"NONE"

[k8s-ci-robot]

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I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[LuckySB]

/ok-to-test

[LuckySB]

external_openstack_lbaas_use_octavia options removed in #6566

[LuckySB]

Some openstack hosters want this configuration

[LuckySB]

please add some docs to openstack.md

[metanovii]

@LuckySB done

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: LuckySB, metanovii

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[floryut]

@metanovii You should rebase, CI error might be linked to the outdated branch status

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[metanovii]

@metanovii You should rebase, CI error might be linked to the outdated branch status

branch is updated but ci failed

[floryut]

@metanovii You should rebase, CI error might be linked to the outdated branch status

branch is updated but ci failed

Thank you, not to worry this one is a random one, I've retried it

[oomichi]

u mean like that?

Sorry for my unclear comment.

[k8s-ci-robot]

Thanks for your pull request. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

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[oomichi]

The code itself seems good for me, thanks for updating.
Just one comment about documentation.

[oomichi]

Thanks for updating.

/lgtm