Making this change for python-cinderclient to be consistent
with Cinder. The same change was made to Cinder via
commit ff3f2e5735f0d486b72b6881b05ace94d6d34d03 .
Partial-bug 1229324
Change-Id: I69fb960f499f0c9a9c9671d46d10170477cf6695
NOTE:
* openstack/common/* should be synced from oslo, so i leave them
untouched.
* add (c) symbol for related lines, leave others untouched.
Change-Id: I46a87c7f248d3468b1fdf5661411962faf2fb875
Fixes-Bug: #1214176