iniset_rpc_backend default section

iniset_rpc_backend should know what section it needs to set the
config options in better than the callers. The config options
have actually been moved to different sections and the options
in the DEFAULT section are deprecated.

Change-Id: I0e07fe03c7812ef8df49e126bf71c57588635639
diff --git a/lib/neutron b/lib/neutron
index e41abaf..a31a064 100755
--- a/lib/neutron
+++ b/lib/neutron
@@ -422,7 +422,7 @@
 # Set common config for all neutron server and agents.
 function configure_neutron {
     _configure_neutron_common
-    iniset_rpc_backend neutron $NEUTRON_CONF DEFAULT
+    iniset_rpc_backend neutron $NEUTRON_CONF
 
     # goes before q-svc to init Q_SERVICE_PLUGIN_CLASSES
     if is_service_enabled q-lbaas; then