DynamicRESTMapper does not return No{Kind,Resource}MatchError for non-present API groups

[timebertt]

When calling RESTMapping() and friends for an API Group/GroupVersion that is not present in the system (e.g., CRDs not yet installed), a RESTMapper should return No{Kind,Resource}MatchError.

However, with v0.15.0, the new DynamicRESTMapper returns ErrGroupDiscoveryFailed instead, e.g.

failed to get API group resources: unable to retrieve the complete list of server APIs: some.group/v1: the server could not find the requested resource

A consequence of this behavior is that managers will crash if they register controllers for resources that will only be registered during runtime. This was supported previously with the old DynamicRESTMapper implementation before v0.15.0.

/kind bug

[timebertt]

/assign

[troy0820]

Is this issue still necessary? I see that this PR #2425 is closed but the above PR that was merged took changes from that PR and applied it.
@timebertt

[timebertt]

Yes, we can close this one!
/close

[k8s-ci-robot]

@timebertt: Closing this issue.

In response to this:

Yes!
/close

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