Rename schema group to openshift io

[ingvagabund]

What this PR does / why we need it:

Rename openstackproviderconfig.k8s.io to openstackproviderconfig.openshift.io.

All openshift machine types are required to live under .openshift.io group.
The same holds for provider configs/specs which are shipped with openshift by default.

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:

[ingvagabund]

Given the providerspec is encoded through yaml, installer generated provider spec apiversion is ignored. Thus, the group suffix can be changed in parallel: openshift/installer#2152

[tomassedovic]

/hold

I'm really sorry about this, the OpenStack deployments (including the e2e-openstack job) have been broken by openshift/library-go#500. I'm putting this on hold to prevent merging before we can fully test it.

The fix (openshift/cluster-kube-controller-manager-operator#275) is merged, but we need to wait for a new release image to get created and re-run the e2e test.

The change itself looks good to me.

[tomassedovic]

/retest

[tomassedovic]

/hold cancel
/lgtm
/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ingvagabund, tomassedovic

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