feat(btrfs): adding support to have btrfs filesystem for ZFS-LocalPV

Now, applications can use the btrfs file system by mentioning "btrfs"
as fstype in the storageclass :-

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

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

buildscripts/zfs-driver/Dockerfile

@@ -12,10 +12,11 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM ubuntu:19.10
+FROM ubuntu:20.04
 RUN apt-get clean && rm -rf /var/lib/apt/lists/*
 RUN apt-get update; exit 0
 RUN apt-get -y install rsyslog libssl-dev xfsprogs ca-certificates
+RUN apt-get -y install btrfs-progs
 
 ARG ARCH
 ARG DBUILD_DATE

changelogs/unreleased/170-pawanpraka1

@@ -0,0 +1 @@
+adding support to have btrfs filesystem for ZFS-LocalPV