Does not respect "standard" AWS environment variables

[sethvargo]

The names for the AWS environment variables as documented here are:

• AWS_ACCESS_KEY_ID
• AWS_SECRET_ACCESS_KEY
• AWS_DEFAULT_REGION

Most tools that interact with AWS respect these environment variables, but Terraform uses:

• AWS_ACCESS_KEY
• AWS_SECRET_KEY
• AWS_REGION

While this is documented I do not think it is the ideal user experience and differs from almost every other tool on the Internet which interacts with AWS.

[ghost]

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