Run Neutron migrations after creating schema

Partial-Bug 1207402

This patch executes Neutron DB migrations (based on alembic)
before starting the Neutron services, similar to what happens
for most of other openstack projects managed by devstack.
This will ensure devstack always creates correctly version-stamped
Neutron databases.

Change-Id: Ia941c426a1563bcc4cb5eae64ea30c0bf7677220

lib/neutron

@@ -367,7 +367,9 @@ function create_neutron_initial_network() {
 
 # init_neutron() - Initialize databases, etc.
 function init_neutron() {
-    :
+    recreate_database $Q_DB_NAME utf8
+    # Run Neutron db migrations
+    $NEUTRON_BIN_DIR/neutron-db-manage --config-file $NEUTRON_CONF --config-file /$Q_PLUGIN_CONF_FILE upgrade head
 }
 
 # install_neutron() - Collect source and prepare
@@ -614,12 +616,6 @@ function _configure_neutron_service() {
     cp $NEUTRON_DIR/etc/api-paste.ini $Q_API_PASTE_FILE
     cp $NEUTRON_DIR/etc/policy.json $Q_POLICY_FILE
 
-    if is_service_enabled $DATABASE_BACKENDS; then
-        recreate_database $Q_DB_NAME utf8
-    else
-        die $LINENO "A database must be enabled in order to use the $Q_PLUGIN Neutron plugin."
-    fi
-
     # Update either configuration file with plugin
     iniset $NEUTRON_CONF DEFAULT core_plugin $Q_PLUGIN_CLASS
 

stack.sh

@@ -939,7 +939,10 @@ if is_service_enabled neutron; then
     echo_summary "Configuring Neutron"
 
     configure_neutron
-    init_neutron
+    # Run init_neutron only on the node hosting the neutron API server
+    if is_service_enabled $DATABASE_BACKENDS && is_service_enabled q-svc; then
+        init_neutron
+    fi
 fi
 
 # Some Neutron plugins require network controllers which are not