Improve EC2 instance role and EC2Metadata client error messages #548
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Improves the error messages received for EC2Metadata client requests.
The error message bodies were being dropped by the SDK and are now
included in the error returned.
Also updates the SDK to returned errors to be chained in a stack so that
nested errors are not ignored. This change updates the SDK so that the
chain of errors which occurred are all included. Instead of just the first error.
Fix #545