Fix a few issues with deleting storage objects.

src/virtManager/storagepool.py

@@ -72,8 +72,11 @@ class vmmStoragePool(gobject.GObject):
         self.pool.destroy()
         self._update_xml()
 
-    def delete(self):
-        self.pool.undefine()
+    def delete(self, nodelete=True):
+        if nodelete:
+            self.pool.undefine()
+        else:
+            self.pool.delete(0)
         del(self.pool)
 
     def _update_xml(self):

src/virtManager/storagevol.py

@@ -47,7 +47,7 @@ class vmmStorageVolume(gobject.GObject):
         return self.vol.path()
 
     def delete(self):
-        self.vol.undefine()
+        self.vol.delete(0)
         del(self.vol)
 
     def get_xml(self):