Feature gate HC by cluster feature gate object

[ingvagabund]

Machine API created its own feature gate object key and diverged from all other
components expecting 'cluster' key instead. Renaming the key to 'cluster'
to minimize the confusion.

[openshift-ci-robot]

@ingvagabund: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/actuator-pkg-staleness	cab58a8	link	/test actuator-pkg-staleness

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[ingvagabund]

Waiting until #318 gets merged

/hold

[frobware]

#318 merged.

/hold cancel
/lgtm
/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: frobware

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