Nova deprecated proxying options in the DEFAULT group

In Kilo Nova deprecated proxying options in the DEFAULT group.  Instead
they were moved to the "neutron" group.  This resulted in the metadata
service not serving up metadata.

See this bug for more information:

    https://bugzilla.redhat.com/show_bug.cgi?id=1217999

Change-Id: I4f7eac0100d31c5329f8d1857f6d7da1bb6784da

docker/nova-base/config-nova.sh

@@ -84,8 +84,8 @@ if [ "${NETWORK_MANAGER}" == "nova" ] ; then
   crudini --set $cfg DEFAULT public_interface $PUBLIC_INTERFACE
 elif [ "${NETWORK_MANAGER}" == "neutron" ] ; then
   check_required_vars NEUTRON_SHARED_SECRET
-  crudini --set $cfg DEFAULT service_neutron_metadata_proxy True
-  crudini --set $cfg DEFAULT neutron_metadata_proxy_shared_secret ${NEUTRON_SHARED_SECRET}
+  crudini --set $cfg neutron service_metadata_proxy True
+  crudini --set $cfg neutron metadata_proxy_shared_secret ${NEUTRON_SHARED_SECRET}
   crudini --set $cfg DEFAULT neutron_default_tenant_id default
   crudini --set $cfg DEFAULT network_api_class nova.network.neutronv2.api.API
   crudini --set $cfg DEFAULT security_group_api neutron