Open Stack

Hi,
There is valid concern about the upgrade procedure with this patch. 
There is a way that we are able to do this without creating an major 
problems:
1. Leave the class QuantumLinuxBridgeVIFDriver unchanged
2. Add in a new class QuantumLinuxBridgeVIFDriverEnhanced (or if someone 
has a better name). This class will contain the changes. If someone 
wants to benefit fro the changes then she/he will need to update their 
configuration file to:
     
libvirt_vif_driver=nova.virt.libvirt.vif.QuantumLinuxBridgeVIFDriverEnhanced
This can be documented and it may treat all of the concerns. Naturally a 
patch upstream will need to be added so that this wil be forward compatible.
Thoughts?
Thanks
Gary