Automatic merge from submit-queue

Add printer#EnsurePrintHeaders method

This patch adds a new `EnsurePrintHeaders` method to the
HumanReadablePrinter `ResourcePrinter`, which allows headers to be
printed in cases where multiple lists of the same resource are printed
consecutively, but are separated by non-printer related information.

Related downstream PR: https://github.com/openshift/origin/pull/12528

**Release note**:
```release-note
release-note-none
```

cc @fabianofranz @AdoHe