add MultiClusterHub

[rnetser]

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More details:

What this PR does / why we need it:

Which issue(s) this PR fixes:

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Bug:

[redhat-qe-bot]

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[rnetser]

/cherry-pick v4.15 v4.14

[redhat-qe-bot]

Cherry-pick requested for PR: add MultiClusterHub by user rnetser
Adding label/s cherry-pick-v4.15 cherry-pick-v4.14 for automatic cheery-pick once the PR is merged

[myakove]

/lgtm

[rnetser]

/verified

[redhat-qe-bot]

Cherry-picked PR add MultiClusterHub into v4.14

[redhat-qe-bot]

Cherry-picked PR add MultiClusterHub into v4.15