Use six.wraps instead of functools
Use six.wraps instead of functools

Currently constraint for six is >=1.9, so it's time to solve the
TODO point over functools.wraps and make behaviour consistent on py2/py3

Change-Id: I23996a4aec3561c7b0f6fec00a60f8c16b2e22a6

openstack/oslo.log