pyocf: Delete Io object in pyocf before putting in OCF

To avoid Io reuse (new io with same pointer could be allocated before
deleting from pyocf instance tracking dictionary).

Signed-off-by: Jan Musial <jan.musial@intel.com>

tests/functional/pyocf/types/io.py

@@ -92,8 +92,8 @@ class Io(Structure):
         except:  # noqa E722
             pass
 
-        self.put()
         self.del_object()
+        self.put()
 
     def submit(self):
         return OcfLib.getInstance().ocf_volume_submit_io(byref(self))