Add new owners to various sub-projects.

Test: treehugger
Change-Id: Ia2a99c0499633ccc5d23c37a1ec93867c876d637
diff --git a/property_service/OWNERS b/property_service/OWNERS
index babbe4d..7529cb9 100644
--- a/property_service/OWNERS
+++ b/property_service/OWNERS
@@ -1 +1 @@
-tomcherry@google.com
+include platform/system/core:/janitors/OWNERS