Add external_openstack_cacert file from host

[Nathanael-Mtd]

What type of PR is this?
/kind feature

What this PR does / why we need it:
Same as with the in-tree openstack cloud controller, copy external_openstack_cacert file retrieved from ansible host to the control-plane for secret creation.

Does this PR introduce a user-facing change?:

It remove the needs of manual copy of the openstack ca-cert file to the first control plane.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: Nathanael-Mtd / name: Nathanaël M. (7615702, 5060928)

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[k8s-ci-robot]

Hi @Nathanael-Mtd. Thanks for your PR.

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[mzaian]

/ok-to-test

[yankay]

/lgtm

[yankay]

/retest

[ant31]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ant31, mzaian, Nathanael-Mtd

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[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[Nathanael-Mtd]

Hi @yankay, I made a mistake the last time with a merge request instead of rebase (but fixed since weeks), and lgtm tag was removed. Can you re-check if it's ok, and @ErikJiang can you review this PR please ?
Thank you !