This bug was fixed in the package python-oslo.context - 2.2.0-2ubuntu1

---------------
python-oslo.context (2.2.0-2ubuntu1) xenial; urgency=medium

  * Adding support unicode for older type of user id (LP: #1507937)
    - d/p/0001-Ensure-to_dict-supports-unicode.patch

 -- Seyeong Kim <seyeong....@canonical.com>  Wed, 21 Mar 2018 02:23:53
-0700

** Changed in: python-oslo.context (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1507937

Title:
  Tenant does not support non-ascii characters

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive mitaka series:
  Fix Committed
Status in oslo.context:
  Fix Released
Status in python-oslo.context package in Ubuntu:
  Invalid
Status in python-oslo.context source package in Xenial:
  Fix Released

Bug description:
  [Impact]

  Affected to trusty-mitaka, only has older form of user id

  Assume that there is unicode user id (like John Gāo) from ldap on trusty-kilo 
env.
  and Upgraded to trusty-mitaka.

  I can't command nova list with 500 error and nova-api log show us
  unicode error like below

  UnicodeEncodeError: 'ascii' codec can't encode character u'\xe1' in
  position 1: ordinal not in range(128)

  [Test Case]

  TBD for detail script or info

  0. proper ldap setting(accounts etc..) with user id has unicode character as 
above
  1. deploy trusty-kilo env
  - without ldap config,
  - if i set ldap config at the beginning, there is error because by default 
config blocks CRUD user on ldap)
  2. setting ldap configuration
  - https://pastebin.ubuntu.com/p/pfzNDPgccd/
  3. remove CRUD block on keystone.conf temporarily
  - https://pastebin.ubuntu.com/p/HD7mPwHDjM/
  4. need to set up password for nova, cinder, etc service accounts
  - openstack user set --password-prompt nova ( for all services )
  - you can check password in each services configuration file
  5. upgrade to trusty-mitaka
  - https://pastebin.ubuntu.com/p/d6Wcp7HQVr/
  6. source novarc
  7. nova list

  you can get 500 error

  [Regression]

  This patch is simple, but need to restart every api service e.g nova-
  api, glance-api, cinder-api etc because they are handling user id for
  getting information respectively. This causes temporarily service
  down.

  [Others]

  If I deployed trusty-mitaka in the beginning, keystone user id is form
  of uuid, so no need to patch this basically.

  [Original description]
  When Tenant name contains any non-acsii characters (such as Chinese), calling 
oslo_context/context.py#to_dict method will cause a unicodeEncodeError: 'ascii' 
codec can't encode characters in position 0-3: ordinal not in range(128).

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