push out some deprecations to figure out what's using these bits

There are some parts of devstack we should really delete, but we have
no idea who is using them. Push out some deprecations so we can look
at this through logstash.

Change-Id: Id5c8748606cce16f64e978ad7ac9309bebac0eb7
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index 78eb55d..73a1bcd 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -433,15 +433,18 @@
 
     # goes before q-svc to init Q_SERVICE_PLUGIN_CLASSES
     if is_service_enabled q-lbaas; then
+        deprecated "Configuring q-lbaas through devstack is deprecated"
         _configure_neutron_lbaas
     fi
     if is_service_enabled q-metering; then
         _configure_neutron_metering
     fi
     if is_service_enabled q-vpn; then
+        deprecated "Configuring q-vpn through devstack is deprecated"
         _configure_neutron_vpn
     fi
     if is_service_enabled q-fwaas; then
+        deprecated "Configuring q-fwaas through devstack is deprecated"
         _configure_neutron_fwaas
     fi
     if is_service_enabled q-agt q-svc; then