Failure if awscli credentials not setup on local machine

[blakeca00]

keyup enters continuous execution loop if awscli credentials are not setup on the local machine.

The Fix:

keyup should check for the existence of the .aws directory first before:

1. Attempting to read & display key info (--operation list)
2. Attempting to rotate keys (--operation up)
3. Running a key report (--key-report)

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