Use Pre-existing Floating IP for Bastion

[feber]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Use a pre-existing floating IP for bastion node, instead of creating a new one.
Similar with assigning floating IP for k8s master nodes via k8s_master_fips.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Should be no.

[Openstack] Use a pre-existing floating IP for bastion node, instead of creating a new one.

[linux-foundation-easycla]

The committers are authorized under a signed CLA.

• ✅ Febrian Setianto (11f6720, 8f8727a)

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[k8s-ci-robot]

Hi @feber. Thanks for your PR.

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[floryut]

@feber Thank you for the PR (and for signing up CLA)
/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[oomichi]

/lgtm