Make neutron work with Kilo

Neutron was loading a bunch of modules that are not currently
supported in Kolla.  Remove them as they were causing problems
loading Neutron.

Partially-Implements: blueprint port-kilo

Change-Id: If53071bbb0a22aa05219b9e99ca6d693f96db4ce

docker/neutron/neutron-base/config-neutron.sh

@@ -116,7 +116,7 @@ crudini --set $core_cfg \
 crudini --set $core_cfg \
         DEFAULT \
         service_plugins \
-        "neutron.services.l3_router.l3_router_plugin.L3RouterPlugin,neutron.services.loadbalancer.plugin.LoadBalancerPlugin,neutron.services.vpn.plugin.VPNDriverPlugin,neutron.services.metering.metering_plugin.MeteringPlugin"
+        "neutron.services.l3_router.l3_router_plugin.L3RouterPlugin"
 crudini --set $core_cfg \
         DEFAULT \
         allow_overlapping_ips \