[Terraform-Openstack] Add optional Octavia loadbalancer for Master Nodes

[jaszil]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test

/kind feature

/kind flake

What this PR does / why we need it:

Added possibility to build an Openstack octavia loadbalancer for the Kubernetes Api.
The LoadBalancer is useful to make the cluster reachable from outside if only k8s_masters_no_floating_ip is set

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

[Terraform-openstack] Added possibility to build an octavia loadbalancer for the Kubernetes Api.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: jaszil (6e75a8f, b322fd0, dd89b9b, 0f17730)

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[k8s-ci-robot]

Hi @jaszil. Thanks for your PR.

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[yankay]

/ok-to-test

[floryut]

@jaszil Thank you, can you check the CI ?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: floryut, jaszil

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[yankay]

Thanks @jaszil
/lgtm