Comment 22 for bug 1494281

Attempt to test provider external networks with ml2_conf.ini

[ml2]
type_drivers = local,flat,gre,vxlan
tenant_network_types = vxlan
mechanism_drivers =openvswitch
path_mtu = 0
[ml2_type_flat]
flat_networks = *
[ml2_type_vlan]
[ml2_type_gre]
[ml2_type_vxlan]
vni_ranges =1001:2000
vxlan_group =239.1.1.2
[ml2_type_geneve]
[securitygroup]
enable_security_group = True

Results same error , patch https://review.openstack.org/225001 eliminates the problem with
restart neutron-openvswitch-agent.service