Add a notice for node e2e config files

test/e2e_node/jenkins/OWNERS

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+approvers:
+- dashpole
+- krzyzacy
+- Random-Liu
+- yguo0905
+- yujuhong

test/e2e_node/jenkins/README.md

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+# Node e2e job migration notice:
+
+Sig-testing is actively migrating node e2e jobs from Jenkins to [Prow],
+and we are moving *.property and image-config.yaml files to [test-infra]
+
+If you want to update those files, please also update them in [test-infra].
+
+If you have any questions, please contact @krzyzacy or #sig-testing.
+
+
+## Test-infra Links:
+Here's where the existing node e2e job config live:
+
+[Image config files](https://github.com/kubernetes/test-infra/tree/master/jobs/e2e_node)
+
+[Node test job args (.properties equivalent)](https://github.com/kubernetes/test-infra/blob/master/jobs/config.json)
+
+
+[test-infra]: https://github.com/kubernetes/test-infra
+[Prow]: https://github.com/kubernetes/test-infra/tree/master/prow