storage: adding delete_dump

disk.py

+import json
 import os
 import subprocess
 import re
@@ -32,6 +33,9 @@ class Disk(object):
 
     @classmethod
     def deserialize(cls, desc):
+        logging.info(desc)
+        if isinstance(desc, basestring):
+            desc = json.loads(desc)
         return cls(**desc)
 
     def get_desc(self):

storagedriver.py

 from disk import Disk
 from storagecelery import celery
-
+from os import path, unlink
 
 @celery.task()
 def list(dir):
@@ -20,6 +20,12 @@ def delete(json_data):
 
 
 @celery.task()
+def delete_dump():
+    if path.endswith(".dump") and os.path.isfile(path):
+        os.unlink(path)
+
+
+@celery.task()
 def snapshot(json_data):
     disk = Disk.deserialize(json_data)
     disk.snapshot()