Enable DVR + HA support

Juno brings two new big features:
- distributed routers
- router high availability

This patchs aims to allow the users to configure DVR and/or HA routers.
Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>

Change-Id: Iaab5ab7e63f2627381ca1d5bb1cfd836433d734e