follow up PR 421 to make ubuntu and centos work

[jichenjc]

What this PR does / why we need it:

The PR #421 has some missing code change for ubuntu and centos,
I created ubuntu correctly but centos has some issue (#391), so modify the code according to
ubuntu changes only

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

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[jichenjc]

@sbueringer PTAL, thanks

[sbueringer]

/lgtm

[sbueringer]

But if this PR here works for you it means we don't need the cacert for APIServer, right? :)

Which makes sense to me. Because I don't think APIServer calls OpenStack

[jichenjc]

@sbueringer
https://github.com/kubernetes-sigs/cluster-api-provider-openstack/blob/master/pkg/cloud/openstack/services/userdata/kubeadm.go#L71 already has it

[sbueringer]

@sbueringer
https://github.com/kubernetes-sigs/cluster-api-provider-openstack/blob/master/pkg/cloud/openstack/services/userdata/kubeadm.go#L71 already has it

Yup. But only for the controller-manager. The apiserver has the same cloudprovider openstack flags but no cacert

[jichenjc]

ok, maybe I missed something, anyway, let's be it and if we find some issue later, we can do modifications