IsAdmissionPluginActivated returns true if the admission plugin is activated using configapi.DefaultAdmissionConfig otherwise it returns a default value.

TODO: Remove this when a YAML serializer is available from upstream.

TODO: Remove this when a YAML serializer is available from upstream.

OldestVersion is the string that represents the oldest server version supported, for client code that wants to hardcode the lowest common denominator.

Version is the string that represents the current external default version.

Versions is the list of versions that are recognized in code.