Automated docker validation tests

[dchen1107]

We introduced node test infrastructure for 1.2 release, and engineers are working on docker validation test suite too. We should automate today's docker release validation process by fetching the latest docker release candidate from docker.io and run our node conformance tests.

cc/ @kubernetes/goog-node

[dchen1107]

@liangchenye I am assigning this one to you for now. Please let us know if you don't have the bandwidth for this.

[liangchenye]

@dchen1107 I have 1/3 of my working hour on this between March and April. I'll update my progress by submit PRs.

[dchen1107]

@liangchenye Could you delegate this to one of your co-workers since I don't have their github names? Thanks!

[liangchenye]

@dchen1107, I'll catch up with the 'docker unique test' this week and see if it is necesary to delegate to other co-workers.

[Random-Liu]

Also ref #21013

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