The nsx-v FWaaS driver will add the configured firewall rules to
the router edges.
Currently there is not support for shared routers.
The rules will be edded after the current rules (NAT, LBaaS, external traffic)
for exclusive routers edges and distributed routers PLR edged.
Change-Id: I82ba90070ef4e739a0b5c4463ef03a807e26adfb