WIP: Buffer tuning for https://issues.redhat.com/browse/RFE-6849

[alanconway]

This PR has the proposed API changes needed for https://issues.redhat.com/browse/RFE-6849
The functionality is not implemented.

[openshift-ci]

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[openshift-ci]

@alanconway: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/functional-target	b7d2645	link	true	/test functional-target
ci/prow/e2e-target	b7d2645	link	true	/test e2e-target
ci/prow/unit	b7d2645	link	true	/test unit

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[alanconway]

@jcantrill all good catches, hopefully now all fixed. Let me know.