rfserver: Install flows to drop traffic by default
rfserver: Install flows to drop traffic by default

This limits the traffic that a switch will forward to the controller, so
we will only ever get traffic that we explicitly request -- messages
such as ARP,ICMP and routing protocol traffic.

Signed-off-by: Joe Stringer <da02367898403910c66f5d62c3a247888772ce8a@gmail.com>

arazmj/RouteFlow,srijanmishra/RouteFlow,routeflow/RouteFlow,raphaelvrosa/RouteFlow,CPqD/RouteFlow,srijanmishra/RouteFlow,arazmj/RouteFlow,rsanger/RouteFlow,c3m3gyanesh/RouteFlow-OpenConfig,c3m3gyanesh/RouteFlow-OpenConfig,arazmj/RouteFlow,rsanger/RouteFlow,arazmj/RouteFlow,arazmj/RouteFlow,ralph-mikera/RouteFlow-1,routeflow/RouteFlow,raphaelvrosa/RouteFlow,rsanger/RouteFlow,arazmj/RouteFlow,routeflow/RouteFlow,srijanmishra/RouteFlow,ralph-mikera/RouteFlow-1,ralph-mikera/RouteFlow-1,srijanmishra/RouteFlow,ralph-mikera/RouteFlow-1,CPqD/RouteFlow,CPqD/RouteFlow,routeflow/RouteFlow,rsanger/RouteFlow,c3m3gyanesh/RouteFlow-OpenConfig,rsanger/RouteFlow,raphaelvrosa/RouteFlow,raphaelvrosa/RouteFlow,raphaelvrosa/RouteFlow,rsanger/RouteFlow,CPqD/RouteFlow,srijanmishra/RouteFlow,c3m3gyanesh/RouteFlow-OpenConfig,raphaelvrosa/RouteFlow,CPqD/RouteFlow,c3m3gyanesh/RouteFlow-OpenConfig,ralph-mikera/RouteFlow-1,ralph-mikera/RouteFlow-1,c3m3gyanesh/RouteFlow-OpenConfig,routeflow/RouteFlow