Use application PHIDs in Pholio Mocks

Summary: Ref T2715. Switch mocks to the new stuff.

Test Plan: Used phid.query and phid.lookup to find mocks.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2715

Differential Revision: https://secure.phabricator.com/D6517