fix: idle timeout of NLB has 350s fixed according to https://docs.aws.amazon.com/elasticloadbalancing/latest/network/network-load-balancers.html#connection-idle-timeout , +2s for skipper
fix: idle timeout of NLB has 350s fixed according to https://docs.aws.amazon.com/elasticloadbalancing/latest/network/network-load-balancers.html#connection-idle-timeout , +2s for skipper

Signed-off-by: Sandor Szücs <f0c8058f71fcfe5afd63dc9873b61c5120cb7f65@zalando.de>

zalando-incubator/kubernetes-on-aws,zalando-incubator/kubernetes-on-aws,zalando-incubator/kubernetes-on-aws