High Priority
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  - Add http/json request module to make client tool work [Qiming]
  - Support action_create
  - Support action_delete
  - Support action_cancel
  - Support event_delete

Middle Priority
===============

  - Figure out how to set USER_AGENT

  - Use code from https://review.openstack.org/#/c/95679/ to replace
    _append_global_identity_args(parser)

  - Add unit tests

Low Priority
============