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Deprecate cloudstack and ovirt controller projects
Change-Id: Icca9142940269ad1cd28f1f3491684a1bc626c55
**What this PR does / why we need it**:
Do we have folks invested in these providers trying to work on the external controllers for these providers? Is there a future for these providers? If not can we deprecate and eventually remove them?
**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**:
cc @ngtuna @sebgoa @svanharmelen (for cloudstack)
cc @simon3z
**Release note**:
```release-note
Deprecate cloudstack and ovirt controllers
```