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Fix Failed Subjob Result Sending (#454)

* Retry sending results on subjob completion up to 5 times with a linear sleep to resolve the issue where sometimes subjobs would fail to send on first attempt and cause a run to never send all results and show as In Progress indefinitely.
* Check if executor count is >= 0 instead of == 0 when marking a slave as idle. There was a bug where a slave could get to a negative executor count likely through a race condition and cause an Exception here.
* Rename stages of Dockerfile to be more explicit and utilize builder stage for building a test image and running tests in docker for easier local development.
* Added targets docker-lint and docker-test to Makefile for making local testing in the same docker image as we build our rpm in possible.

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