Document That Descheduler Considers StatefulSets For Eviction

[seanmalloy]

Similar to ReplicaSet, ReplicationController, and Jobs pods with a
StatefulSet metadata.ownerReference are considered for eviction.
Document this, so that it is clear to end users.

[seanmalloy]

/kind documentation
/assign @damemi
/cc @ingvagabund

Part of #519

[ingvagabund]

@seanmalloy worth mentioning StatefulSet in https://github.com/kubernetes-sigs/descheduler/blame/master/README.md#L549 as well.

[seanmalloy]

@seanmalloy worth mentioning StatefulSet in https://github.com/kubernetes-sigs/descheduler/blame/master/README.md#L549 as well.

I believe I already took care of this, but let me know if I'm not understanding correctly.

[ingvagabund]

I believe I already took care of this, but let me know if I'm not understanding correctly.

Right, sorry, looking into wrong README.md :)

[ingvagabund]

/lgtm

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[seanmalloy]

@damemi and @ingvagabund I added the initial unit tests for StatefulSets. This PR is ready for review again. If it is alright with you I will add the StatefulSet e2e tests in a separate PR.

[seanmalloy]

Also, I can squash the two documentation commits into a single commit once we think the changes are good.

[ingvagabund]

Looks good, please squash

[seanmalloy]

Looks good, please squash

@ingvagabund and @damemi it is squashed into two commits. One for the doc updates and one for the unit test updates.

[ingvagabund]

/lgtm