1009117 Refactored for readability

[andyreidz]

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[buildmachine-sou-jenkins2]

CI Build Link:
https://sou-jenkins2.swinfra.net/job/WorkerFramework/job/WorkerFramework~worker-framework~1009117-review~CI

[buildmachine-sou-jenkins2]

The Documentation QA site for this branch has been built:
https://workerframework-ci-worker-framework-1009117-review-441722.glpages.otxlab.net

[DavidGerald-Milligan]

@andyreidz I have reviewed again and made some minor updates to tests. I deployed update-entities and classification workers employing this build, and the updated message-distribution worker where we pass the original headers on larry and re-tested the 'mark false positive' function. The the headers are passed through to the workers and the issue of the message looping is no longer present. The flow through the workers is good, and I checked the datastore on larry and the stored files are cleaned up as expected, though I do notice that the directories created in storing the taskMessage are still present, albeit empty.