Comment 3 for bug 1537033

After small investigation of this issue the following behaviour was found. If we want to change ml2 vlan range, then we upload config

---
configuration:
 neutron_plugin_ml2:
  ml2_type_vlan/network_vlan_ranges:
    value: "physnet2:1000:1001,physnet1"

and after executing of command:
 # fuel openstack-config --env 1 --execute

just file configuration "/etc/neutron/plugins/ml2/ml2_conf.ini" will be changed but will not applyed. it may be checked creating networks from user with admin role.
# neutron net-create <network_name>
Network has data. There is field "provider:segmentation_id" which must be filled from values if ml2 vlan range from file "/etc/neutron/plugins/ml2/ml2_conf.ini".

For applying this configuration we need to restart service "neutron-server" on each controller node. And I guess this action should be run on step "fuel openstack-config --env 1 --execute".