deploy: remove preStop hook from daemonset templates

The lifecycle preStop hook fails on container stop / exit
because /bin/sh is not present in the driver registrar container
image.

the driver-registrar will remove the socket file
before stopping. we dont need to have any preStop hook
to remove the socket as it was not working as expected

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

deploy/cephfs/kubernetes/csi-cephfsplugin.yaml

@@ -29,14 +29,6 @@ spec:
             - "--v=5"
             - "--csi-address=/csi/csi.sock"
             - "--kubelet-registration-path=/var/lib/kubelet/plugins/cephfs.csi.ceph.com/csi.sock"
-          lifecycle:
-            preStop:
-              exec:
-                command: [
-                  "/bin/sh", "-c",
-                  "rm -rf /registration/cephfs.csi.ceph.com \
-                  /registration/cephfs.csi.ceph.com-reg.sock"
-                ]
           env:
             - name: KUBE_NODE_NAME
               valueFrom: