Automatic merge from submit-queue

Node Conformance Test: Final cleanup for node conformance test.

This PR fits node conformance test with recent change.
* Remove `--manifest-path` because the test will get kubelet configuration through `/configz` now. https://github.com/kubernetes/kubernetes/pull/36919
* Add `$TEST_ARGS` so that we can override arguments inside the container.
* Fix a bug in garbage_collector_test.go which will cause the framework tries to connect docker no matter running the test or not. @dashpole 
* Add `${REGISTRY}/node-test:${VERSION}` for convenience. 
* Bump up the image version to `0.2`. (the one released with v1.4 is `v0.1`)

I've run the test both with `run_test.sh` script and directly `docker run`. Both of them passed.

After this gets merged, I'll build and push the new test image.

@dchen1107 
/cc @kubernetes/sig-node