Sync strutils from oslo
Sync strutils from oslo

Sync strutils from oslo which fix safe_encode under py3, this gets
keystone CLI to properly output results.

84d461 Fix a bug in safe_encode where it returns a bytes object in py3

Closes-Bug: 1260824
Change-Id: Idf0f3a51f5cfe3077395b53da66a12955449861f

jamielennox/keystoneauth,citrix-openstack-build/keystoneauth,sileht/keystoneauth