leave re-scheduled volume status to creating

A re-scheduled volume should not be exported and set to available

Fixes bug #1159027

Change-Id: Ie61d9132ce1bd6461d5e4d9836424ebf14100389
(cherry picked from commit b823de4)

cinder/volume/manager.py

@@ -260,6 +260,7 @@ def create_volume(self, context, volume_id, request_spec=None,
                                             snapshot_id, image_id,
                                             request_spec, filter_properties,
                                             allow_reschedule)
+                return
 
             if model_update:
                 volume_ref = self.db.volume_update(