Force Releeph to be installed during unit tests
Summary: Fixes failure in "testApplicationInstalled" if this flag is off (as it is by default).
Test Plan: Ran "testApplicationsInstalled" with this flag off.
Reviewers: garoevans, btrahan
Reviewed By: btrahan
CC: aran
Differential Revision: https://secure.phabricator.com/D5979