storage: added new remote tasks

circle/storage/tasks/remote_tasks.py

@@ -39,3 +39,18 @@ def get(path):
 @celery.task(name='storagedriver.merge')
 def merge(src_disk_desc, dst_disk_desc):
     pass
+
+
+@celery.task(name='storagedriver.make_free_space')
+def make_free_space(datastore, percent):
+    pass
+
+
+@celery.task(name='storagedriver.move_to_trash')
+def move_to_trash(datastore, disk_path):
+    pass
+
+
+@celery.task(name='storagedriver.get_storage_stat')
+def get_storage_stat(path):
+    pass