Merge pull request #53816 from marun/remove-federation

Automatic merge from submit-queue (batch tested with PRs 54112, 54150, 53816, 54321, 54338). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Remove federation

This PR removes the federation codebase and associated tooling from the tree.

The first commit just removes the `federation` path and should be uncontroversial.  The second commit removes references and associated tooling and suggests careful review.

Requirements for merge:

- [x] Bazel jobs no longer hard-code federation as a target ([test infra #4983](https://github.com/kubernetes/test-infra/pull/4983))
- [x] `federation-e2e` jobs are not run by default for k/k

**Release note**:

```release-note
Development of Kubernetes Federation has moved to github.com/kubernetes/federation.  This move out of tree also means that Federation will begin releasing separately from Kubernetes.  The impact of this is Federation-specific behavior will no longer be included in kubectl, kubefed will no longer be released as part of Kubernetes, and the Federation servers will no longer be included in the hyperkube binary and image.
```

cc: @kubernetes/sig-multicluster-pr-reviews @kubernetes/sig-testing-pr-reviews

cluster/common.sh

@@ -160,20 +160,6 @@ function clear-kubeconfig() {
   echo "Cleared config for ${CONTEXT} from ${KUBECONFIG}"
 }
 
-# Creates a kubeconfig file with the credentials for only the current-context
-# cluster. This is used by federation to create secrets in test setup.
-function create-kubeconfig-for-federation() {
-  if [[ "${FEDERATION:-}" == "true" ]]; then
-    echo "creating kubeconfig for federation secret"
-    local kubectl="${KUBE_ROOT}/cluster/kubectl.sh"
-    local cc=$("${kubectl}" config view -o jsonpath='{.current-context}')
-    KUBECONFIG_DIR=$(dirname ${KUBECONFIG:-$DEFAULT_KUBECONFIG})
-    KUBECONFIG_PATH="${KUBECONFIG_DIR}/federation/kubernetes-apiserver/${cc}"
-    mkdir -p "${KUBECONFIG_PATH}"
-    "${kubectl}" config view --minify --flatten > "${KUBECONFIG_PATH}/kubeconfig"
-  fi
-}
-
 function tear_down_alive_resources() {
   local kubectl="${KUBE_ROOT}/cluster/kubectl.sh"
   "${kubectl}" delete deployments --all || true
@@ -936,17 +922,6 @@ AUTOSCALER_EXPANDER_CONFIG: $(yaml-quote ${AUTOSCALER_EXPANDER_CONFIG})
 EOF
   fi
 
-  # Federation specific environment variables.
-  if [[ -n "${FEDERATION:-}" ]]; then
-    cat >>$file <<EOF
-FEDERATION: $(yaml-quote ${FEDERATION})
-EOF
-  fi
-  if [ -n "${FEDERATION_NAME:-}" ]; then
-    cat >>$file <<EOF
-FEDERATION_NAME: $(yaml-quote ${FEDERATION_NAME})
-EOF
-  fi
   if [ -n "${DNS_ZONE_NAME:-}" ]; then
     cat >>$file <<EOF
 DNS_ZONE_NAME: $(yaml-quote ${DNS_ZONE_NAME})