changes to interface options

Nova has more than one way things can get done and I need
to figure out which one working for our env.

Adding my_ip

Lets see if adding my_ip will let me route and reach my vm's
correctly

Adding my_ip

Lets see if adding my_ip will let me route and reach my vm's
correctly

Remove gateway option

I don't know if this is needed or not. Got to love the docs

Removed flat_interface

After removing the flat_interface it appears to be working
Adding config option for routing_source

In the etc/nova/nova.conf

routing_source_ip={{nova.network.routing_source}}