Support ChainInsertMode config option for Calico Networking

[asmith030]

Add support for the ChainInsertMode configuration option when using Calico networking.

From https://docs.projectcalico.org/reference/felix/configuration:

Controls whether Felix hooks the kernel’s top-level iptables chains by inserting a rule at the top of the chain or by appending a rule at the bottom. Insert is the safe default since it prevents Calico’s rules from being bypassed. If you switch to Append mode, be sure that the other rules in the chains signal acceptance by falling through to the Calico rules, otherwise the Calico policy will be bypassed. [Default: Insert]

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[k8s-ci-robot]

Hi @asmith030. Thanks for your PR.

I'm waiting for a kubernetes 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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[rifelpet]

/ok-to-test

[hakman]

Please also add validation for the new option, similar to the Canal one. Other than that, looks good.

kops/pkg/apis/kops/validation/validation.go

Lines 657 to 660 in 036ea69

	if v.ChainInsertMode != "" {
	valid := []string{"insert", "append"}
	allErrs = append(allErrs, IsValidValue(fldPath.Child("chainInsertMode"), &v.ChainInsertMode, valid)...)
	}

[KashifSaadat]

Thanks for the contribution @asmith030 !

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: asmith030, KashifSaadat

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