Env variables require default values

[clstokes]

The work to allow setting Terraform variables via environment variables (#62 and #1621) is great, but it requires that variables have default values - which is not ideal for variables such as AWS credentials. I would expect variables passed via environment variables to not require defaults the same as if they were set in a tfvars file.

$ TF_VAR_aws_access_key=asdf TF_VAR_aws_secret_key=1234 terraform plan
There are warnings and/or errors related to your configuration. Please
fix these before continuing.

Errors:

  * Required variable not set: aws_access_key
  * Required variable not set: aws_secret_key

[mitchellh]

Ah, this is a bug. Thanks.

[ghost]

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