Description of problem:
=======================
context: See Bug #1168242

Tenant networks represent the network types allowed for a user to use when he create networks while he's not an admin.

In this example: 

CONFIG_NEUTRON_ML2_TYPE_DRIVERS=vxlan,gre,vlan
CONFIG_NEUTRON_ML2_TENANT_NETWORK_TYPES=vxlan,gre

I refrained from using 'vlan' for tenant network types since I use the 'vlan' type for external networks (and didn't want users to be able to use the vlan segmentation ids).

As a result: packstack didn't tap the provider ovs-bridge to a NIC, which broke every external connectivity (and usage of floating ips) for instances.


Version-Release number of selected component (if applicable):
=============================================================
RHEL-OSP6: openstack-packstack-2014.2-0.13.dev1395.gaabe0a2.el7ost.noarch


How reproducible:
=================
100%


Steps to Reproduce:
===================
In packstack answer file, configure the following attributes:

CONFIG_NEUTRON_ML2_TYPE_DRIVERS=vxlan,gre,vlan
CONFIG_NEUTRON_ML2_TENANT_NETWORK_TYPES=vxlan,gre


Actual results:
===============
In compute nodes:
    Bridge br-nodes
        Port phy-br-nodes
            Interface phy-br-nodes
                type: patch
                options: {peer=int-br-nodes}
        Port br-nodes
            Interface br-nodes
                type: internal


Expected results:
=================
In compute nodes:
    Bridge br-nodes
        Port "enp5s0f1"
            Interface "enp5s0f1"
        Port phy-br-nodes
            Interface phy-br-nodes
                type: patch
                options: {peer=int-br-nodes}
        Port br-nodes
            Interface br-nodes
                type: internal
        Port "enp5s0f1\nbr-nodes"
            Interface "enp5s0f1\nbr-nodes"


Additional info:
================
See Bug #1168242