Partial export doesn't include feeds referenced by additional packages

[mcasperson]

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Prerequisites

• [ * ] I have verified the problem exists in the latest version
• [ * ] I have searched open and closed issues to make sure it isn't already reported
• [ * ] I have written a descriptive issue title
• [ * ] I have linked the original source of this report
• [ * ] I have tagged the issue appropriately (area/*, kind/bug, tag/regression?)

The bug

When doing a partial export of a project or project group, the migrator tool does not seem to include feeds that are referenced by deployment step additional packages (i.e. when it is walking the references graph). If there are any feeds that are only referenced by step additional packages then these feeds will not be included in the partial export output files.

Steps to reproduce

1. Add a new external package feed
2. Create a new project with a script step Add a reference to a package in the new feed in this script step
3. Perform a partial-export of this project Check the feed folder of the export, the new feed won't be there

Links

Internal links
https://secure.helpscout.net/conversation/1182569478/65564/
https://trello.com/c/uzyJOoBL/3337-migrator-partial-export-doesnt-include-feeds-referenced-by-additional-packages