Explicitly set user root for the gs_watchdogd service. Otherwise host_init_verifier would fail. Bug: 362447627 Test: Treehugger Merged-In: I36a3a67dc357f608b33a131a4e5f6fd6defb91e5 Change-Id: I36a3a67dc357f608b33a131a4e5f6fd6defb91e5