Make "all user" services work when packaged.

services/service_manager/tests/service_manager/singleton_manifest.json

Index: services/service_manager/tests/service_manager/singleton_manifest.json
diff --git a/services/service_manager/tests/service_manager/singleton_manifest.json b/services/service_manager/tests/service_manager/singleton_manifest.json
new file mode 100644
index 0000000000000000000000000000000000000000..65e9fc563b2d19e9412574444fc15466271b8bca
--- /dev/null
+++ b/services/service_manager/tests/service_manager/singleton_manifest.json
@@ -0,0 +1,15 @@
+{
+  "name": "service:service_manager_unittest_singleton",
+  "display_name": "Service Manager Unittest: Singleton",
+  "interface_provider_specs": {
+    "service_manager:connector": {
+      "provides": {
+        "service_manager_unittest:singleton": [ ]
+      },
+      "requires": {
+        "exe:service_manager_unittest_target": [ ],
+        "service:service_manager": [ "service_manager:all_users" ]
+      }
+    }
+  }
+}