Enhancement: Have an option for a single control/data interface for vlan mode

[dvavili]

Description

Have a single interface that can be used for both and control and data interface for vlan mode. In environments where there is a single interface for the host (typically for public could VMs with cost implications), provide an option to use the interface for both control and data traffic in vlan mode.

[rchirakk]

this will cause network connectivity failure for short time.