Airflow-docker

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* Fix missing kwargs in role assumption extension to enable `role_set_env_vars`

Authors:

* Li Chen

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* Add configuration to the aws role assumption extension to set environment variables instead of writing a file.

Authors:

* Hunter Senft-Grupp

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Update the tester image to allow for non-dag files.

Authors:

* Dan Cardin

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Update config access to remove direct access to configuration method 'has_option', which has been deprecated.

Authors:

* Gordon Fierce

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No code changes.
Updated requirements. Relaxed boto3 range.

Authors:

* Gordon Fierce

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* Bumped airflow version to 1.10.9 and releasely version to >=1.1
* Added python-3.8-test step as dependency of coverage step

Authors:

* Hunter Senft-Grupp