Prepare to support an "Ignore generated files" flag in Owners
5e2af4b9b5cd
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Description

Prepare to support an "Ignore generated files" flag in Owners

Summary:
Depends on D19425. Ref T13130. See PHI251. Now that changesets have a durable "generated" attribute, we can let owners packages check it when we're computing which packages are affected by a revision.

There's no way to actualy configure a package to have this behavior yet.

Test Plan:

Created a revision affecting a generated file and a non-generated file.
- When I faked mustMatchUngeneratedPaths() to return true;, saw the non-generated file get no packages owning it.
- Normally: lots of packages owning it).
Created a revision affecting only generated files.
- When I faked things, saw no Owners actions trigger.
- Normally: some packages added reviewers or subscribers.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13130

Differential Revision: https://secure.phabricator.com/D19426