Summary:
There's a crash when `arc diff` is running it's lint / unit test
phase which describes that this function should be public instead
of private:
```Fatal error: Access level to PhabricatorPholioMockTestDataGenerator::loadPhabrictorUserPHID() must be public (as in class PhabricatorTestDataGenerator) in /srv/www/tychaia.com/phab/phabricator/src/applications/pholio/lipsum/PhabricatorPholioMockTestDataGenerator.php on line 102```
Test Plan: `arc diff` should not crash.
Reviewers: epriestley
Reviewed By: epriestley
CC: aran, Korvin
Differential Revision: https://secure.phabricator.com/D5828
