Config initialisation is wrong

[mr-karan]

If there are no specific AWS static keys provided to the Provider struct, it results in:

operation error Route 53: ListHostedZonesByName, failed to sign request: failed to retrieve credentials: static credentials are empty

However, valid AWS keys are present in the enviornment:

AWS_ACCESS_KEY_ID=
AWS_SECRET_ACCESS_KEY=
AWS_SESSION_TOKEN=

The config.LoadDefaultConfig is sufficient to read these keys from the environment, so no special initialization is needed.

The NewStaticCredentialsProvider should only be chained if AccessKeyId in Provider is a non empty value.

[aymanbagabas]

Thanks for reporting this. I think this is a valid issue, will fix this soon.