Airflow-docker

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Pin versions in CI.

Authors:

* Gordon Fierce

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* Ensure dag tester test failures print out the reason why they failed.

Authors:

* Dan Cardin

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* Update airflow-queue-stats plugin to fix a bug in the backlog task count implementation.

Authors:

* Hunter Senft-Grupp

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* Added airflow-queue-stats to project. This provides a json endpoint to get queue and worker information.

Authors:

* Hunter Senft-Grupp

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* Added an aws role assumption extension to permit task level aws role assumption
* Added an 'extensions' tab to the airflow docker UI tab to view loaded extension docs
* Small fixes to eliminate noisy task log warnings

Authors:

* Hunter Senft-Grupp

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* Upgraded airflow from 1.10.2 to 1.10.5
* Dropped support for airflow on python 3.5 due to version imcompatibilities with airflow libraries.
* Updated default configuration files with necessary upgrading changes
* Added an example config.json in the example dags and turned on the EnvironmentPreset extension

Authors:

* Hunter Senft-Grupp