Fix neutron ml2 configuration for Ironic
Fix neutron ml2 configuration for Ironic

vxlan should be allowed in tenant_network_types because it used in
tunnel_types.
Allow all flat networks when ironic enabled.

TrivialFix
Change-Id: I39b2fbf26bb4c9047e7c3ea5ca7749ae113e4ed8

mandre/kolla,nihilifer/kolla,stackforge/kolla,dardelean/kolla-ansible,GalenMa/kolla,mandre/kolla,toby82/kolla,rahulunair/kolla,openstack/kolla,tonyli71/kolla,GalenMa/kolla,coolsvap/kolla,coolsvap/kolla,stackforge/kolla,nihilifer/kolla,stackforge/kolla,mrangana/kolla,intel-onp/kolla,openstack/kolla,mrangana/kolla,dardelean/kolla-ansible,negronjl/kolla,toby82/kolla,rahulunair/kolla,intel-onp/kolla,negronjl/kolla,limamauricio/mykolla,coolsvap/kolla,toby82/kolla,negronjl/kolla,mandre/kolla,dardelean/kolla-ansible,limamauricio/mykolla,tonyli71/kolla,limamauricio/mykolla