Replace deprecated nova_metadata_ip

Option nova_metadata_ip was deprecated in favor
of nova_metadata_host.  lib/neutron was updated
recently but lib/neutron-legacy was missed.

Change-Id: Iadd42458dda705ad0c24aa4ab2afd5b27dd8f0e1
diff --git a/lib/neutron-legacy b/lib/neutron-legacy
index 0ccb17c..bb76c5f 100644
--- a/lib/neutron-legacy
+++ b/lib/neutron-legacy
@@ -757,7 +757,7 @@
     cp $NEUTRON_DIR/etc/metadata_agent.ini.sample $Q_META_CONF_FILE
 
     iniset $Q_META_CONF_FILE DEFAULT debug $ENABLE_DEBUG_LOG_LEVEL
-    iniset $Q_META_CONF_FILE DEFAULT nova_metadata_ip $Q_META_DATA_IP
+    iniset $Q_META_CONF_FILE DEFAULT nova_metadata_host $Q_META_DATA_IP
     iniset $Q_META_CONF_FILE DEFAULT metadata_workers $API_WORKERS
     iniset $Q_META_CONF_FILE AGENT root_helper "$Q_RR_COMMAND"
     if [[ "$Q_USE_ROOTWRAP_DAEMON" == "True" ]]; then