Installer: auto generate target service namespace in port forwards

Change-Id: Id7e0dcdd750034375c796881e86b1f3eb53e9299
diff --git a/core/installer/values-tmpl/gerrit.cue b/core/installer/values-tmpl/gerrit.cue
index c68e9ac..a2a88f9 100644
--- a/core/installer/values-tmpl/gerrit.cue
+++ b/core/installer/values-tmpl/gerrit.cue
@@ -107,9 +107,7 @@
 	allocator: input.network.allocatePortAddr
 	reservator: input.network.reservePortAddr
 	sourcePort: input.sshPort
-	// TODO(gio): namespace part must be populated by app manager. Otherwise
-	// third-party app developer might point to a service from different namespace.
-	targetService: "\(release.namespace)/gerrit-gerrit-service"
+	serviceName: "gerrit-gerrit-service"
 	targetPort: _sshPort
 }]