Commits on Sep 27, 2019

1. Allow stderr passthrough for credential_process …

   Many organizations now require MFA for AWS login, or perhaps fetch
   credentials from a command-line password manager. While `stdout` of
   the `credential_process` is used to acquire the credential token,
   `stderr` is captured for raising an exception back to the user.
   
   In order enable user-interaction with the credential provider process,
   it must have access to some stream the user can see: in this case,
   `stderr`. This commit provides that change.
   
   In order to maintain a relatively high level of backwards
   compatibility, we will continue to capture `stderr` for raising
   exceptions _unless_ `stderr` is reporting as being a TTY device, in
   which case we assume that user-interaction is more favorable than
   detailed exceptions.

   

   twooster committed Sep 27, 2019
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