fix(volume provisioning): fix CStor volume creation without PVC

This PR fixes CStor volume provisioning issue. Currently
REST request to create CStor volume will fail if request
is made without creating PVC because of following bug:
- When the REST API is called to create volume it will
  verify whether request payload has PVC name. If PVC
  name doesn't exist then it will skip execution of
  `cstor-volume-create-puttargetservice-default` runtask
  but with latest changes of PR [1735](openebs-archive#1735)
   above runtask is not skiped and leads to failure in creation
  of CStor volume.

Signed-off-by: mittachaitu <sai.chaithanya@mayadata.io>

pkg/volume/volume.go

@@ -176,7 +176,7 @@ func (v *Operation) Create() (*v1alpha1.CASVolume, error) {
 	if len(pvcName) == 0 {
 		cast.Spec.RunTasks.Tasks = util.RemoveItemFromSlice(
 			cast.Spec.RunTasks.Tasks,
-			version.WithSuffix("cstor-volume-create-getpvc-default"),
+			version.WithSuffixLower("cstor-volume-create-getpvc-default"),
 		)
 	}