R1:d3cf7874ede5

Use application PHIDs in Repositories

Summary: Ref T2715. Move repositories to new app PHIDs.

Test Plan: Used `phid.lookup`; `phid.query`; browsed Diffusion.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2715

Differential Revision: https://secure.phabricator.com/D6529