Return distinct source names from the facility API

[jwalgran]

Overview

A problem with duplicate contributor names appearing on the facility detail page emerged when contributors began submitting the same facility via the API multiple times. To avoid this we update the facility serializer to process the list of sources and remove duplicates.

Connects https://github.com/open-apparel-registry/open-apparel-registry-clients/issues/12

Testing Instructions

• Check out develop
• Run ./scripts/resetdb
• Browse http://localhost:8081/api/docs/#!/facilities/facilities_create and Authenticate with the token created during ./scripts/resetdb
• POST the following twice

{
    "country": "US",
    "address": "990 Spring Garden, Philadelphia",
    "name": "Azavea"
}

• Go to the details page for the new facility and verify the unwanted behavior: the contributor appears twice.
• Download and rename azavea.csv.txt to azavea.csv
• Browse http://localhost:6543/contribute and upload the list without specifying a name
• Run this command to create a bash helper function

function batch_process { ./scripts/manage batch_process --list-id $1 --action parse && ./scripts/manage batch_process --list-id $1 --action geocode && ./scripts/manage batch_process --list-id $1 --action match; }

• Process the list with batch_process 16
• Browse http://localhost:6543/contribute and submit the same list.
• Process the list with batch_process 17
• Browse the facility details page and verify that there are now 4 contributors, two API submissions and 2 list submissions
• Checkout this branch and refresh the facility details page. Verify that there are now 2 items in the contributors list.

Checklist

• fixup! commits have been squashed
• CI passes after rebase
• CHANGELOG.md updated with summary of features or fixes, following Keep a Changelog guidelines

[rajadain]

Taking a look now

[rajadain]

+1 tested works well. Great job on the detailed testing instructions.

[jwalgran]

Thanks for the review.