Convert functools.wraps() usage to six.wraps()

Convert usage of functools.wraps() to six.wraps() which sets the
'__wrapped__' attribute as is done in Python 3.2 and later.

Change-Id: I3ce7f934c09f8cbdf9eab04f88c57d66a6ccc794

ironic/common/glance_service/base_image_service.py

@@ -15,7 +15,6 @@
 #    under the License.
 
 
-import functools
 import os
 import sys
 import time
@@ -61,7 +60,7 @@ def _translate_plain_exception(exc_value):
 
 def check_image_service(func):
     """Creates a glance client if doesn't exists and calls the function."""
-    @functools.wraps(func)
+    @six.wraps(func)
     def wrapper(self, *args, **kwargs):
         """Wrapper around methods calls.
 

ironic/conductor/task_manager.py

@@ -94,13 +94,12 @@ raised in the background thread.):
 
 """
 
-import functools
-
 from oslo_config import cfg
 from oslo_log import log as logging
 from oslo_utils import excutils
 from oslo_utils import timeutils
 import retrying
+import six
 
 from ironic.common import driver_factory
 from ironic.common import exception
@@ -121,7 +120,7 @@ def require_exclusive_lock(f):
     as the first parameter after "self".
 
     """
-    @functools.wraps(f)
+    @six.wraps(f)
     def wrapper(*args, **kwargs):
         # NOTE(dtantsur): this code could be written simpler, but then unit
         # testing decorated functions is pretty hard, as we usually pass a Mock

ironic/drivers/base.py

@@ -20,7 +20,6 @@ Abstract base classes for drivers.
 import abc
 import collections
 import copy
-import functools
 import inspect
 import json
 import os
@@ -624,7 +623,7 @@ def _passthru(http_methods, method=None, async=True, driver_passthru=False,
 
         passthru_logmessage = _LE('vendor_passthru failed with method %s')
 
-        @functools.wraps(func)
+        @six.wraps(func)
         def passthru_handler(*args, **kwargs):
             try:
                 return func(*args, **kwargs)
@@ -1043,7 +1042,7 @@ def driver_periodic_task(parallel=True, **other):
     semaphore = eventlet.semaphore.BoundedSemaphore()
 
     def decorator2(func):
-        @functools.wraps(func)
+        @six.wraps(func)
         def wrapper(*args, **kwargs):
             if parallel:
                 def _internal():

ironic/drivers/modules/ucs/helper.py

@@ -16,10 +16,9 @@
 Ironic Cisco UCSM helper functions
 """
 
-import functools
-
 from oslo_log import log as logging
 from oslo_utils import importutils
+import six
 
 from ironic.common import exception
 from ironic.common.i18n import _
@@ -55,7 +54,7 @@ def requires_ucs_client(func):
         mentioned above before and after calling the actual function.
     """
 
-    @functools.wraps(func)
+    @six.wraps(func)
     def wrapper(self, task, *args, **kwargs):
         if kwargs.get('helper') is None:
             kwargs['helper'] = CiscoUcsHelper(task)