Move NLB's VPC CIDR security group rule logic into model

[rifelpet]

This way the security group rule task doesn't need to be aware of VPCs, since we should always know the VPC CIDR ahead of time via cluster spec.

This also fixes the terraform and cloudformation rendering of this rule (see the added cidr block in the integration test outputs)

These rules are for NLB's health checks. The AWS docs recommend allowing access from the entire VPC CIDRs
Also add rules for additionalNetworkCIDRs, supporting VPCs with multiple CIDR blocks.

ref: #9011 (comment)

[k8s-ci-robot]

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[k8s-ci-robot]

@rifelpet: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-kops-bazel-test	b272898	link	/test pull-kops-bazel-test

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[seh]

I tried a build based on commit b272898 and it failed the same way it did before, but now I see we have f082848.

[hakman]

/lgtm