Merge pull request #3879 from k8s-infra-cherrypick-robot/cherry-pick-3872-to-release-1.10

[release-1.10] Remove control-plane-azure-json before creation

Author: k8s-ci-robot

hack/create-custom-cloud-provider-config.sh

@@ -28,7 +28,8 @@ make --directory="${REPO_ROOT}" "${KUBECTL##*/}"
 if [[ -n "${CUSTOM_CLOUD_PROVIDER_CONFIG:-}" ]]; then
   curl --retry 3 -sL -o tmp_azure_json "${CUSTOM_CLOUD_PROVIDER_CONFIG}"
   envsubst < tmp_azure_json > azure_json
-  kubectl create secret generic "${CLUSTER_NAME}-control-plane-azure-json" \
+  "${KUBECTL}" delete secret "${CLUSTER_NAME}-control-plane-azure-json" || true
+  "${KUBECTL}" create secret generic "${CLUSTER_NAME}-control-plane-azure-json" \
     --from-file=control-plane-azure.json=azure_json \
     --from-file=worker-node-azure.json=azure_json
   rm tmp_azure_json azure_json