Merge branch 'bucket-prefixes'

### 3. Create the storage class

```bash

kubectl create -f storageclass.yaml

kubectl create -f examples/storageclass.yaml

```

### 4. Test the S3 driver

1. Create a pvc using the new storage class:

```bash

kubectl create -f pvc.yaml

kubectl create -f examples/pvc.yaml

```

2. Check if the PVC has been bound:

1. Check if the PVC has been bound:

```bash

$ kubectl get pvc csi-s3-pvc

csi-s3-pvc   Bound     pvc-c5d4634f-8507-11e8-9f33-0e243832354b   5Gi        RWO            csi-s3         9s

```

3. Create a test pod which mounts your volume:

1. Create a test pod which mounts your volume:

```bash

kubectl create -f pod.yaml

kubectl create -f examples/pod.yaml

```

If the pod can start, everything should be working.

4. Test the mount

1. Test the mount

```bash

$ kubectl exec -ti csi-s3-test-nginx bash

## Additional configuration

### Bucket

By default, csi-s3 will create a new bucket per volume. The bucket name will match that of the volume ID. If you want your volumes to live in a precreated bucket, you can simply specify the bucket in the storage class parameters:

```yaml

kind: StorageClass

apiVersion: storage.k8s.io/v1

metadata:

  name: csi-s3-existing-bucket

provisioner: ch.ctrox.csi.s3-driver

parameters:

  mounter: rclone

  bucket: some-existing-bucket-name

```

If the bucket is specified, it will still be created if it does not exist on the backend. Every volume will get its own prefix within the bucket which matches the volume ID. When deleting a volume, also just the prefix will be deleted.

### Mounter

As S3 is not a real file system there are some limitations to consider here. Depending on what mounter you are using, you will have different levels of POSIX compability. Also depending on what S3 storage backend you are using there are not always [consistency guarantees](https://github.com/gaul/are-we-consistent-yet#observed-consistency).

            capabilities:

              add: ["SYS_ADMIN"]

            allowPrivilegeEscalation: true

          image: ctrox/csi-s3:v1.1.1

          image: ctrox/csi-s3:dev

          imagePullPolicy: Never

          args:

            - "--endpoint=$(CSI_ENDPOINT)"

            - "--nodeid=$(NODE_ID)"