Add 4.2.21 to stable

[joepvd]

Note, there might be legit concerns to add the upgrade path to stable-4.3.

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[vrutkovs]

/cc @jottofar

[sdodson]

Yeah, can you please split the two changes into different PRs?

[sdodson]

/hold
Need to split stable-4.3 addition of 4.2 versions for now.

[LalatenduMohanty]

Need to split stable-4.3 addition of 4.2 versions for now.

+1

[sdodson]

/close
I'll split this

[openshift-ci-robot]

@sdodson: Closed this PR.

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/close
I'll split this

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