Set vif_driver when using quantum/ovs

There is an issue with quantum security groups that requires the VIF
driver to be set to the OVS hybrid VIF driver instead of the generic
driver.

Change-Id: Iffcedcc78646b2b07791e77cbf40ef74facb5d2a
Don't prompt for nova networking info if quantum is being installed

Change-Id: I57b41d6d09610a527acf3a20d47f50b0ee27cea1
Merge "Don't prompt for nova networking info if quantum is being installed"
Merge "Set vif_driver when using quantum/ovs"