R1:3160bb0932df

Use application PHIDs in Phlux

Summary: Ref T2715. PVAR -> app phids

Test Plan: Used `conduit.query` to load one.

Reviewers: btrahan

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T2715

Differential Revision: https://secure.phabricator.com/D6557