origin should support calling an external test binary implemented using openshift-tests-extension. There's an external test binary already in the hyperkube repo: https://github.com/openshift/kubernetes/tree/master/openshift-hack/cmd/k8s-tests-ext

Here's the existing external binary using the legacy interface:

https://github.com/openshift/origin/blob/master/pkg/test/ginkgo/cmd_runsuite.go#L174-L179

That can just be removed and replaced with k8s-test-ext.

MVP requires for k8s-tests:

• Support for list and run-tests:
  • openshift-tests runs list, to support the ExtensionTestSpec JSON format instead of the legacy one

• • Run the tests with the main loop alongside origin's existing tests
  • Process the ExtensionTestResult format, and convert it to JUnit and origin's internal representations (origin's testCase structure)

Additional things for later:

• Support suites by getting them from the "info" command and CEL expressions to filter tests
• Handle the informing/blocking lifecycle for tests(informing shouldn't make openshift-tests exit 1)

The design should be flexible enough to allow a scheduling algorithm that takes into account available resources/isolation, but the first pass doesn't need to implement it yet.