Automatic merge from submit-queue (batch tested with PRs 43642, 43170, 41813, 42170, 41581)

Cleanup make test-integration

``make test-integration`` was using the first positional arg passed to ``WHAT`` to filter the list of integration test packages.  This PR switches to passing ``WHAT`` verbatim to be consistent with how ``make test`` works.  That means the new way to scope execution to a single integration package will be:

```bash
make test-integration WHAT="./test/integration/auth" KUBE_TEST_ARGS="-run=^TestKindAuthorization$"
```

Instead of:

```bash
make test-integration WHAT="auth -test.run=^TestKindAuthorization$"
```

This PR also ensures that the script exits after running a single test case and that etcd cleanup is not done twice at the end of a successful test run.  Both were issues encountered while diagnosing the scoping issue.

cc: @thockin @deads2k @stevekuznetsov @ncdc @derekwaynecarr