aws_iam_login method needs tests

[briantist]

SUMMARY

There's some difficulty to this one, as we don't have any AWS IAM stuff to set up a backend against.

Unit tests can be added for a lot of it though, especially the validation/option processing.

For some level of integration, I am considering introducing MMock, and trying to mock the Vault API end of things so that we never actually have to contact AWS.

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[briantist]

Basic units are added in #161 , those will be fleshed out more soon, hopefully with the addition of some integration tests.