kube-router: bump version v2.5.0 -> 2.7.1

[aauren]

@hakman

Updates kube-router from 2.5.0 -> 2.7.1

Did a full run through of the e2e suite's network related functions and everything stays the same as previous releases.

[k8s-ci-robot]

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[hakman]

/test pull-kops-e2e-cni-kuberouter

[hakman]

I think this may need to stay unchanged. See #17945.

[k8s-ci-robot]

@aauren: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-aws-upgrade-k133-ko133-to-kstable-kolatest-many-addons	fcb2645	link	false	/test pull-kops-e2e-aws-upgrade-k133-ko133-to-kstable-kolatest-many-addons
pull-kops-e2e-cni-kuberouter	fcb2645	link	false	/test pull-kops-e2e-cni-kuberouter

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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