refactored mount, attach, resize operation's so that all failures generate events and event generation is more consistent.

refactored operation generator and operation executor to use more general generated functions for operations, completions, and events.

pkg/controller/volume/persistentvolume/pv_controller.go

@@ -1250,7 +1250,7 @@ func (ctrl *PersistentVolumeController) doDeleteVolume(volume *v1.PersistentVolu
 
 	opComplete := util.OperationCompleteHook(plugin.GetPluginName(), "volume_delete")
 	err = deleter.Delete()
-	opComplete(err)
+	opComplete(&err)
 	if err != nil {
 		// Deleter failed
 		return false, err
@@ -1373,7 +1373,7 @@ func (ctrl *PersistentVolumeController) provisionClaimOperation(claimObj interfa
 
 	opComplete := util.OperationCompleteHook(plugin.GetPluginName(), "volume_provision")
 	volume, err = provisioner.Provision()
-	opComplete(err)
+	opComplete(&err)
 	if err != nil {
 		strerr := fmt.Sprintf("Failed to provision volume with StorageClass %q: %v", storageClass.Name, err)
 		glog.V(2).Infof("failed to provision volume for claim %q with StorageClass %q: %v", claimToClaimKey(claim), storageClass.Name, err)