Ensure $HOME/.aws directory and .*rc, .*profile files are free of AWS access keys

[pburkholder]

In order to [reason/outcome/goal], [someone or "we"] want [a specific change in product implementation/behavior]

Acceptance Criteria

• [ ] GIVEN [a precondition] \ AND [another precondition] WHEN [test step] \ AND [test step] \ THEN [verification step] \ AND [verification step]

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Security considerations

[note any potential changes to security boundaries, practices, documentation, risk that arise directly from this story]

Implementation sketch

[links to background notes, sketches, and/or relevant documentation

• [ ] [first thing to do]
• [ ] [another thing to do]

[pburkholder]

Closed with #35