Comment 45 for bug 1393268

Reviewed: https://review.openstack.org/204248
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=a1819ff0696635c516d0eb1c59fa4f70cae27d65
Submitter: Jenkins
Branch: master

commit a1819ff0696635c516d0eb1c59fa4f70cae27d65
Author: Pavlo Shchelokovskyy <email address hidden>
Date: Tue Jul 21 23:08:00 2015 +0300

    Do not use rich objects is servers update

    - Use new ServerUpdateProgress tasks that support delayed
      API calls (not only checks).
      As this new task imposes restrictions on compute plugin API,
      move all Server*Progress classes to new, plugin-agnostic module.
      Simple unit tests for this class added.
    - Changed logic in Nova client plugin to not use scheduler tasks.
    - Moved server interface attach/detach to Nova client plugin.
    - Split resize in two distinct methods 'resize' and 'verify_resize',
      with their own checkers. This allows better handling of such 'delayed'
      VM status transitions as
      ACTIVE->[resize]->ACTIVE->RESIZING->VERIFY_RESIZE->[confirm]->
      ->VERIFY_RESIZE->ACTIVE
      It might also make it easier later to plug a user notification in
      verify_resize instead of optimistically confirming it.
    - rebuild/resize and interface attach/detach are also made more resilent,
      tolerating intermittent API failures, allowing update logic
      to retry API call later.
    - Instance.handle_update was refactored similar to Server resource,
      with building tasks for update moved to separate private methods.

    Change-Id: Ic78adf878aac09e56f5c50052ee78bdf5b11aa21
    Partial-Bug: #1393268