add statefulset workload for RDR

rdr/busybox/statefulset/app-busybox-1-statefulset/app-1-statefulset.yaml

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+---
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: app-statefulset
+spec:
+  selector:
+    matchLabels:
+      app: app-statefulset # has to match .spec.template.metadata.labels
+  replicas: 5
+  template:
+    metadata:
+      labels:
+        app: app-statefulset # has to match .spec.selector.matchLabels
+    spec:
+      terminationGracePeriodSeconds: 10
+      containers:
+      - command: ["/bin/sh", "-c"]
+        args:
+          - wget  https://raw.githubusercontent.com/red-hat-storage/ocs-workloads/master/rdr/busybox/scripts/simple_io.sh -O /mnt/test/simple_io.sh;
+            wget https://raw.githubusercontent.com/red-hat-storage/ocs-workloads/master/rdr/busybox/scripts/simple_io_integrity_check.sh -O /mnt/test/simple_io_integrity_check.sh;
+            chmod +x /mnt/test/simple_io.sh; chmod +x /mnt/test/simple_io_integrity_check.sh;
+            /mnt/test/simple_io.sh
+        image: quay.io/ocsci/busybox:latest
+        env:
+        - name: IO_SCRIPT
+          value: "/mnt/test/simple_io.sh"
+        - name: DATA_INTEGRITY_SCRIPT
+          value: "/mnt/test/simple_io_integrity_check.sh"
+        imagePullPolicy: IfNotPresent
+        name: busybox
+        volumeMounts:
+        - mountPath: /mnt/test
+          name: app-sfs-pvc
+  volumeClaimTemplates:
+  - metadata:
+      labels:
+        appname: app_statefulset1
+      name: app-sfs-pvc
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      storageClassName: "ocs-storagecluster-ceph-rbd"
+      resources:
+        requests:
+          storage: 30Gi

rdr/busybox/statefulset/app-busybox-1-statefulset/kustomization.yaml

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+resources:
+- app-1-statefulset.yaml