feat(block): adding block volume support for ZFSPV

[pawanpraka1]

Fixes: openebs/openebs#2971

We can create a Raw Block Volume request using volumemode as block in PVC :-

kind: PersistentVolumeClaim
apiVersion: v1
metadata:
  name: block-claim
spec:
  volumeMode: Block
  storageClassName: zfspv-block
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 5Gi

we can use the below storageclass for RAW block volume:

apiVersion: storage.k8s.io/v1
kind: StorageClass
metadata:
  name: zfspv-block
allowVolumeExpansion: true
parameters:
  poolname: "zfspv-pool"
provisioner: zfs.csi.openebs.io

The driver will create a zvol for this volume and bind mount the block device at the given path.

Signed-off-by: Pawan pawan@mayadata.io

[codecov-io]

Codecov Report

Merging #102 into master will decrease coverage by 0.67%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   23.57%   22.90%   -0.68%     
==========================================
  Files          14       14              
  Lines         475      489      +14     
==========================================
  Hits          112      112              
- Misses        362      376      +14     
  Partials        1        1              

Impacted Files	Coverage Δ
pkg/client/k8s/v1alpha1/node.go	0.00% <0.00%> (ø)

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