Support pluralized Kinds

[crimsonfaith91]

Generated files such as zz_generated.kubebuilder.go do not handle plural form kind name consistently. For instance, some informers call to AppReplicas kind via .AppReplicases(), but others via .AppReplicass().

Furthermore, k get redisreplicases failed to list the objects.

Perhaps we can conform all kind names to singular form.

[pwittrock]

Thanks for finding this. The client gen code appears to improperly pluralize Kinds into resources simply by looking at the final character to see if it is an s - e.g. Fish -> Fishes, Children -> Childrens, Replicas -> Replicases. I can work around this.

[pwittrock]

It actually seems to use this for doing pluralization :(

https://github.com/kubernetes/gengo/blob/3b2d54029f5c97ae1ac22c7dfb9186854c253bbb/namer/plural_namer.go#L36

[pwittrock]

The root of the issue is that https://github.com/kubernetes/code-generator doesn't support pluralized kinds. This means that the names that the client generates will be incorrect. My advice is to keep your Kinds singular - e.g. either AppReplicaSet or AppReplica.

[crimsonfaith91]

@pwittrock Thanks for resolving my doubts! Appreciate it. :)