✨ CIDR blocks for default Security Group rule "Node Port Services"

[krasoffski]

What type of PR is this?
/kind feature

What this PR does / why we need it:
There is issue #3314 which describes problem when default Security Group rule "Node Port Services" it too wide.

This PR allows to specify CIDR Blocks for Security Group rule "Node Port Services" with keeping original behavior if no CIDR Blocks are provided by attribute AWSCluster.spec.network.NodePortIngressRuleCidrBlocks.

In our practice, we've deployed stackgres and add LB for Admin page, but security team found opened ports with this admin page, cause stackgress by default open NodePort too under the hood.
Thus allowing to specify networks from which node port services can be accessed negotiated this problem.

Which issue(s) this PR fixes:
Fixes #3314 (possible fix).

Special notes for your reviewer:
I did not add similar attribute for IPv6 CIDR blocks because there is validation that IPv6 cannot be used with unmanaged clusters at this time..
New unit tests for original and new behavior are added.
Added unit tests for webhook validation of correctness provided CidrBlocks.

Checklist:

• squashed commits
• includes documentation
• includes emojis
• adds unit tests
• adds or updates e2e tests

Release note:

New `AWSCluster.spec.network.NodePortIngressRuleCidrBlocks` parameter  which allows to specify IPv4 CIDR blocks for Security group rule "Node Port Services" instead of default `0.0.0.0/`. 

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @krasoffski. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[AndiDog]

/ok-to-test

[krasoffski]

@AndiDog Thank you, Andreas. Looks like tests are passed.

@richardcase @killianmuldoon guys, could you, please, take a look?