Add Neutron Metering Agent support

In Havana, Neutron has now a Metering Agent which gets meters from
virtual routers.

This patchs aims to allow devstack using this new service.

Change-Id: I17ad83799d60384247b98cc8a93ac032f641c721
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
diff --git a/lib/neutron b/lib/neutron
index 4a3d1b0..5334be6 100644
--- a/lib/neutron
+++ b/lib/neutron
@@ -202,6 +202,12 @@
 # Hardcoding for 1 service plugin for now
 source $TOP_DIR/lib/neutron_plugins/services/loadbalancer
 
+# Agent metering service plugin functions
+# -------------------------------------------
+
+# Hardcoding for 1 service plugin for now
+source $TOP_DIR/lib/neutron_plugins/services/metering
+
 # VPN service plugin functions
 # -------------------------------------------
 # Hardcoding for 1 service plugin for now
@@ -231,6 +237,9 @@
     if is_service_enabled q-lbaas; then
         _configure_neutron_lbaas
     fi
+    if is_service_enabled q-metering; then
+        _configure_neutron_metering
+    fi
     if is_service_enabled q-vpn; then
         _configure_neutron_vpn
     fi
@@ -451,6 +460,10 @@
     if is_service_enabled q-lbaas; then
         screen_it q-lbaas "cd $NEUTRON_DIR && python $AGENT_LBAAS_BINARY --config-file $NEUTRON_CONF --config-file=$LBAAS_AGENT_CONF_FILENAME"
     fi
+
+    if is_service_enabled q-metering; then
+        screen_it q-metering "cd $NEUTRON_DIR && python $AGENT_METERING_BINARY --config-file $NEUTRON_CONF --config-file $METERING_AGENT_CONF_FILENAME"
+    fi
 }
 
 # stop_neutron() - Stop running processes (non-screen)
@@ -630,6 +643,11 @@
     neutron_agent_lbaas_configure_agent
 }
 
+function _configure_neutron_metering() {
+    neutron_agent_metering_configure_common
+    neutron_agent_metering_configure_agent
+}
+
 function _configure_neutron_fwaas() {
     neutron_fwaas_configure_common
     neutron_fwaas_configure_driver