Neutron auto-discovers installed alembic_migrations

Neutron and its sub-projects have been made more intelligent about the
alembic migrations of installed sub-projects. Neutron will now
discover the installed migrations and run them automatically.

Partial-Bug: #1470625

Change-Id: Iec8993b02400ae306abf520e6e70d86bba042c8d

Author: Henry Gessau

lib/neutron-legacy

@@ -609,16 +609,6 @@ function init_neutron {
     recreate_database $Q_DB_NAME
     # Run Neutron db migrations
     $NEUTRON_BIN_DIR/neutron-db-manage --config-file $NEUTRON_CONF --config-file /$Q_PLUGIN_CONF_FILE upgrade head
-    for svc in fwaas lbaas vpnaas; do
-        if [ "$svc" = "vpnaas" ]; then
-            q_svc="q-vpn"
-        else
-            q_svc="q-$svc"
-        fi
-        if is_service_enabled $q_svc; then
-            $NEUTRON_BIN_DIR/neutron-db-manage --service $svc --config-file $NEUTRON_CONF --config-file /$Q_PLUGIN_CONF_FILE upgrade head
-        fi
-    done
 }
 
 # install_neutron() - Collect source and prepare