Feature: nlb zone affinity via r53

[szuecs]

feature: set nlb zone affinity for clients log: log default cross zone and zone affinity config

This enables you to set dns_record.client_routing_policy configuration, such that you can decide for NLB via R53 feature that clients running in the same zone will hit also the same zone of your NLB. This is interesting for cross cluster traffic or traffic that stays in the same cluster but passes the NLB. Valid configurations are:

• availability_zone_affinity
• partial_availability_zone_affinity
• any_availability_zone (default)

see also https://docs.aws.amazon.com/elasticloadbalancing/latest/network/network-load-balancers.html\#load-balancer-attributes and https://docs.aws.amazon.com/elasticloadbalancing/latest/network/network-load-balancers.html\#zonal-dns-affinity

[szuecs]

I want to test in a dev cluster before merge

[AlexanderYastrebov]

LGTM modulo minor comments.

[AlexanderYastrebov]

:+1:

[AlexanderYastrebov]

:+1:

[szuecs]

:+1:

[szuecs]

Default:

With zone affinity set: