zalando-incubator / kube-ingress-aws-controller / 16495265360

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aws: sort subnets in Adapter.FindLBSubnets (#757)

Adapter.FindLBSubnets method is used to specify stack subnets and
becomes a parameter of a CloudFormation template.

This change returns sorted result to avoid sporadic changes to
CloudFormation template that triggers update of CloudFormation stack and
corresponding LoadBalancer Subnets.

Though LoadBalancer Subnets update does not require interruption as per
https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/aws-resource-elasticloadbalancingv2-loadbalancer.html#cfn-elasticloadbalancingv2-loadbalancer-subnets
there is no reason to trigger any unneccessary updates.

Related to
https://github.com/zalando-incubator/kube-ingress-aws-controller/issues/454

Signed-off-by: Alexander Yastrebov <alexander.yastrebov@zalando.de>

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