[release/1.6] Setup pod network after creating the sandbox container

[qiutongs]

This is backporting #5904 to 1.6. It is on top of failpoint control backport in #7455

Testing

$ script/setup/install-failpoint-binaries
$ CONTAINERD_RUNTIME=runc FOCUS=TestRunPodSandboxWithShimStartAndTeardownCNIFailure make cri-integration
$ CONTAINERD_RUNTIME=runc FOCUS=TestRunPodSandboxWithShimDeleteFailure make cri-integration

[k8s-ci-robot]

Hi @qiutongs. Thanks for your PR.

I'm waiting for a containerd 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[qiutongs]

/cc @fuweid @samuelkarp @dmcgowan

[qiutongs]

CI linux integration test failed due to

./script/test/cri-integration.sh: line 49: ENABLE_CRI_SANDBOXES: unbound variable

I mitigated this problem locally by having ENABLE_CRI_SANDBOXES=""

[samuelkarp]

You can drop 5e83a71; the release/1.6 branch doesn't have ENABLE_CRI_SANDBOXES since there is no Sandbox API or sbserver in this version.

[samuelkarp]

/ok-to-test