Bump K8s version to 1.31 in EKS CI script

[wenyingd]

This change is to bump up the EKS version to 1.31 in the CI script.

[antoninbas]

@wenyingd was the issue specific to EKS 1.27, or is it that vanilla K8s 1.27 does not support this field selector?

I am asking because if it is the latter (field selector was introduced after K8s 1.27), then we may need some additional changes. In theory Antrea is supposed to work on all K8s versions >= 1.19 out-of-the-box.

[XinShuYang]

LGTM, EKS test passed in http://34.172.220.207:8080/job/cloud-antrea-eks-conformance-net-policy/88/console.

[wenyingd]

@wenyingd was the issue specific to EKS 1.27, or is it that vanilla K8s 1.27 does not support this field selector?

I am asking because if it is the latter (field selector was introduced after K8s 1.27), then we may need some additional changes. In theory Antrea is supposed to work on all K8s versions >= 1.19 out-of-the-box.

I tried on K8s v1.27.13, it looks that the field selector is not supported either. So it looks it is a general limitation for k8s versions.

Error from server (BadRequest): Unable to find "/v1, Resource=pods" that match label selector "", field selector "spec.hostNetwork=true": field label not supported: spec.hostNetwork

[tnqn]

The field selector was introduced in 1.28 and was not backported: kubernetes/kubernetes@7fb88ee.
We should do client side filtering for compatibility.

[antoninbas]

We should still merge this PR as it is good to upgrade the EKS version we use for CI, but we need another one to remove both usages of the field selector.

[wenyingd]

/test-all

[antoninbas]

Please change the commit message and description as well

[wenyingd]

/test-all

[antoninbas]

LGTM - did the Jenkins CI job for EKS succeed?

[luolanzone]

Hi @wenyingd @XinShuYang I know the job was passed before, since the fix #7012 was merged, could you rerun the this change based on the latest main? Thanks.

[XinShuYang]

LGTM, EKS test passed in http://34.172.220.207:8080/job/cloud-antrea-eks-conformance-net-policy/88/console.

CI with EKS 1.27 also recovered after the merge of #7012. cc @antoninbas @luolanzone