Add policy based routing to `caas_oam` network
For`caas_oam` network traffic routed only to the gateway (if specified).
This will enable cluster external IP connection for pods using this
network, and also closes a loophole, which allowed external connectivity
for these pods on master nodes.
If no gateway specified for `caas_oam` network, then the subnet's first
IP address is assumed.
Change-Id: I85fe01fce55b2da18fc80909d189a778e8c8b7c8
Signed-off-by: Krisztian Lengyel <krisztian.lengyel@nokia.com>