Merge pull request #43137 from shashidharatd/federation-domain

Automatic merge from submit-queue

[Federation] Remove FEDERATIONS_DOMAIN_MAP references

Remove all references to FEDERATIONS_DOMAIN_MAP as this method is no longer is used and is replaced by adding federation domain map to kube-dns configmap.

cc @madhusudancs @kubernetes/sig-federation-pr-reviews 

**Release note**:
```
[Federation] Mechanism of adding `federation domain maps` to kube-dns deployment via `--federations` flag is superseded by adding/updating `federations` key in `kube-system/kube-dns` configmap. If user is using kubefed tool to join cluster federation, adding federation domain maps to kube-dns is already taken care by `kubefed join` and does not need further action.
```

hack/local-up-cluster.sh

@@ -700,19 +700,6 @@ function start_kubedns {
     if [[ "${ENABLE_CLUSTER_DNS}" = true ]]; then
         echo "Creating kube-system namespace"
         sed -e "s/{{ pillar\['dns_domain'\] }}/${DNS_DOMAIN}/g" "${KUBE_ROOT}/cluster/addons/dns/kubedns-controller.yaml.in" >| kubedns-deployment.yaml
-        if [[ "${FEDERATION:-}" == "true" ]]; then
-          FEDERATIONS_DOMAIN_MAP="${FEDERATIONS_DOMAIN_MAP:-}"
-          if [[ -z "${FEDERATIONS_DOMAIN_MAP}" && -n "${FEDERATION_NAME:-}" && -n "${DNS_ZONE_NAME:-}" ]]; then
-            FEDERATIONS_DOMAIN_MAP="${FEDERATION_NAME}=${DNS_ZONE_NAME}"
-          fi
-          if [[ -n "${FEDERATIONS_DOMAIN_MAP}" ]]; then
-            sed -i -e "s/{{ pillar\['federations_domain_map'\] }}/- --federations=${FEDERATIONS_DOMAIN_MAP}/g" kubedns-deployment.yaml
-          else
-            sed -i -e "/{{ pillar\['federations_domain_map'\] }}/d" kubedns-deployment.yaml
-          fi
-        else
-          sed -i -e "/{{ pillar\['federations_domain_map'\] }}/d" kubedns-deployment.yaml
-        fi
         sed -e "s/{{ pillar\['dns_server'\] }}/${DNS_SERVER_IP}/g" "${KUBE_ROOT}/cluster/addons/dns/kubedns-svc.yaml.in" >| kubedns-svc.yaml
         
         # TODO update to dns role once we have one.