Add script to deploy into a single node minikube instance

The script creates a block device image under
/mnt/vda1/heketi-bricks.img that is connected to /dev/loop1.  Then
gk-deploy is started in the single-node mode on top of minikube and a
default storage class gluster-storage is created.

deploy/gk-deploy-minikube

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+#!/bin/bash
+# Copyright (c) 2018 Red Hat, Inc.
+#
+# 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.
+
+SCRIPT_DIR="$(cd "$(dirname "${0}")" && pwd)"
+TOPOLOGY='topology-minikube.json'
+CLI='kubectl'
+
+set -ex
+
+minikube ssh "\
+	sudo truncate -s 10G /mnt/vda1/heketi-bricks.img \
+	&& sudo losetup /dev/loop1 /mnt/vda1/heketi-bricks.img \
+	&& sudo pvcreate /dev/loop1 \
+"
+
+${SCRIPT_DIR}/gk-deploy --yes --single-node --cli ${CLI} --deploy-gluster ${SCRIPT_DIR}/${TOPOLOGY}
+
+HEKETI_URL=$(${CLI} get --no-headers endpoints/heketi | awk '{print $2}')
+
+if minikube addons list | grep -q "default-storageclass: enabled" ; then
+  minikube addons disable default-storageclass
+  ${CLI} patch storageclass standard -p '{"metadata":{"annotations":{"storageclass.beta.kubernetes.io/is-default-class":"false"}}}'
+fi
+
+${CLI} create -f - <<EOF
+apiVersion: storage.k8s.io/v1beta1
+kind: StorageClass
+metadata:
+  name: glusterfs-storage
+  annotations:
+    storageclass.beta.kubernetes.io/is-default-class: "true"
+provisioner: kubernetes.io/glusterfs
+parameters:
+  resturl: "http://${HEKETI_URL}"
+  volumetype: "none"
+EOF

deploy/topology-minikube.json

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+{
+  "clusters": [
+    {
+      "nodes": [
+        {
+          "node": {
+            "hostnames": {
+              "manage": [
+                "minikube"
+              ],
+              "storage": [
+                "172.17.0.1"
+              ]
+            },
+            "zone": 1
+          },
+          "devices": [
+            "/dev/loop1"
+          ]
+        }
+      ]
+    }
+  ]
+}