Remove google_container_cluster.cluster_ipv4_cidr

[rileykarson]

I believe it's superseded by https://www.terraform.io/docs/providers/google/r/container_cluster.html#cluster_ipv4_cidr_block.

[rileykarson]

Hmm- looks like the fields are distinct. The top-level field applies when it's not a VPC-native cluster, and the nested field when the cluster is VPC-native.

The problem is, defining an ip_allocation_policy block at all makes the top-level field no longer work. So if the block is defined and you try to define a pod cidr, neither one will work. I'm not sure there's a remediation.

[rileykarson]

Closing in favour of #4638 which prevents specifying this in ambiguous ways.

[ghost]

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