Add tests for statefulsets

[joestringer]

It appears that StatefulSets operate differently enough in K8s environments that they can trigger some issues in Cilium, such as the following:

https://github.com/cilium/cilium/issues?q=is%3Aissue+statefulset+is%3Aopen

Currently we do not have any tests mentioning statefulsets in the tree. Expanding coverage over the use of StatefulSets may allow us to discover previously unknown issues and help to reproduce user reports.

From discussions on Slack, this seems like it will likely need some multi-node framework for doing lifecycle testing. We have infrastructure today doing this in different ways today:

• Most of test/, built on the ginkgo framework, which aimed to solve e2e tests but which also collected a lot of complicated elements over time such as cluster provisioning, support for different cloud environments, etc.
• L4LB, which runs a relatively simple shell script to validate behaviour.

There may be a few different paths for this, including:

• Cleaning up the existing test/ framework
• Implementing a new shell-based test like L4LB
• Building out fresh testing using either go testing directly, or using ginkgo.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[github-actions[bot]]

This issue has not seen any activity since it was marked stale. Closing.