pkg/operator: don't check version for sub MC in pools

[runcom]

- What I did

The code wasn't honoring the versionCheckRequired for checking sub-MCs in pools. The main MC for the pool must be correctly generated by the correct controller version, that shouldn't be true for sub MCs?

Ref: #487

side note: we should also land #385 somehow

- How to verify it

- Description for the changelog

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[openshift-ci-robot]

@runcom: The following test failed for commit f578f1b, say /retest to rerun them:

Test name	Details	Rerun command
ci/prow/unit	link	/test unit

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