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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This pull-request has been approved by: alanconway

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[alanconway]

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

[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/unit	6c3e43f	link	true	/test unit
ci/prow/e2e-target	6c3e43f	link	true	/test e2e-target
ci/prow/images	6c3e43f	link	true	/test images
ci/prow/functional-target	6c3e43f	link	true	/test functional-target
ci/prow/upgrade	6c3e43f	link	false	/test upgrade

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