Added e2e test for HA master that creates multizone workers.

Added e2e test for HA master that creates multizone workers.

hack/e2e-internal/e2e-shrink-cluster.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Copyright 2014 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE}")/../..
+
+if [[ ! -z "${1:-}" ]]; then
+  export KUBE_GCE_ZONE="${1}"
+fi
+if [[ ! -z "${2:-}" ]]; then
+  export MULTIZONE="${2}"
+fi
+if [[ ! -z "${3:-}" ]]; then
+  export KUBE_DELETE_NODES="${3}"
+fi
+if [[ ! -z "${4:-}" ]]; then
+  export KUBE_USE_EXISTING_MASTER="${4}"
+fi
+
+source "${KUBE_ROOT}/hack/e2e-internal/e2e-down.sh"
+