Remove `log4j-kubernetes` in version 2.x
Due to differences in the lifecycle of Log4j Core and Kubernetes Client,
we remove `log4j-kubernetes` from the 2.x release and redirect users to
Fabric8's own `kubernetes-log4j` artifact introduced in fabric8io/kubernetes-client#5718.
The `log4j-kubernetes` lookup depends on:
* the very stable `StrLookup` interface from Log4j Core,
* the evolving set of Kubernetes metadata provided by Kubernetes Client.
Therefore it makes more sense to distribute the lookup together with
Kubernetes Client.
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