[bug] Local testing in README.md not working with testrunner.py

[kace]

Checklist

• [x] I've prepended issue tag with type of change: [bug]
• [ ] (If applicable) I've attached the script to reproduce the bug
• [ ] (If applicable) I've documented below the DLC image/dockerfile this relates to
• [ ] (If applicable) I've documented below the tests I've run on the DLC image
• [ ] I'm using an existing DLC image listed here: https://docs.aws.amazon.com/deep-learning-containers/latest/devguide/deep-learning-containers-images.html
• [ ] I've built my own container based off DLC (and I've attached the code used to build my own image)

Concise Description: The procedure for running EKS tests described in our README.md don't work as documented.

DLC image/dockerfile:

Current behavior:

Expected behavior:

Additional context: