Sync oslo apiclient module

Patch [1] fixes some python 3 compatibility issues with apiclient module.
So sync apiclient module from fb738d40bb0a9ef6d840a08dc9ac327b0be73b74

[1] https://review.openstack.org/#/c/58070/

Change-Id: Ib46aecc1ebcb250ef2631af555f73eb8af06ff7d
Merge "Sync oslo apiclient module"