OADP-5952: downstream only, update error message disableFsBackup (openshift#380)

* OADP-5952: clear error for disableFsBackup

This error message can be carried in OADP-1.5
Upstream issue:
vmware-tanzu#8185

Signed-off-by: Wesley Hayutin <[email protected]>

* fix error message and test

---------

Signed-off-by: Wesley Hayutin <[email protected]>

Author: weshayutin

pkg/exposer/host_path.go

@@ -62,7 +62,10 @@ func GetPodVolumeHostPath(ctx context.Context, pod *corev1.Pod, volumeName strin
 
 	path, err := singlePathMatch(pathGlob, fs, logger)
 	if err != nil {
-		return datapath.AccessPoint{}, errors.Wrapf(err, "error identifying unique volume path on host for volume %s in pod %s", volumeName, pod.Name)
+		return datapath.AccessPoint{}, errors.Wrapf(err, "error identifying unique volume path "+
+			"on host for volume %s in pod %s, or the DPA spec.configuration.velero.disableFsBackup "+
+			"is set to true, please contact your administrator. ",
+			volumeName, pod.Name)
 	}
 
 	logger.WithField("path", path).Info("Found path matching glob")

pkg/exposer/host_path_test.go

@@ -65,7 +65,7 @@ func TestGetPodVolumeHostPath(t *testing.T) {
 			},
 			pod: builder.ForPod(velerov1api.DefaultNamespace, "fake-pod-2").Result(),
 			pvc: "fake-pvc-1",
-			err: "error identifying unique volume path on host for volume fake-pvc-1 in pod fake-pod-2: fake-error-2",
+			err: "error identifying unique volume path on host for volume fake-pvc-1 in pod fake-pod-2, or the DPA spec.configuration.velero.disableFsBackup is set to true, please contact your administrator. : fake-error-2",
 		},
 		{
 			name: "get block volume dir success",