Support adding custom secondary VPC CIDR blocks in AWSCluster
(backport)
#590
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Backport of kubernetes-sigs#4898 into our
release-2.3
branch. Includes an extended version of Mario's fix for subnet selection.This is to fully support Cilium ENI mode (giantswarm/roadmap#2563). By creating a secondary CIDR and then specifying 3 more private subnets in that CIDR, Cilium can be configured to choose those subnets for pod IPs.