Comment 2 for bug 1091490

Reviewed: https://review.openstack.org/18284
Committed: http://github.com/openstack/nova/commit/4e02fa1964f5de3a6ba345d858623f35b24beafd
Submitter: Jenkins
Branch: master

commit 4e02fa1964f5de3a6ba345d858623f35b24beafd
Author: Ken'ichi Ohmichi <email address hidden>
Date: Tue Jan 8 05:08:17 2013 +0900

    Add exception handler for previous deleted flavor.

    An exception happens if a previous flavor is deleted and
    'nova resize-revert' run, because 'nova resize-revert' does
    not handle the deleted flavor.
    And also we have the same problem in _update_usage_from_migration().
    This patch fixes the problems.

    How to reproduce the problem on DevStack:
      $ nova flavor-create sample 10 512 0 2
      $ nova boot --image cirros-0.3.0-x86_64-uec --flavor sample test01
      $ nova resize test01 m1.tiny
      $ nova flavor-delete 10
      $ nova resize-revert test01

    Before applying this patch:
      $ nova resize-revert test01
      ERROR: The server could not comply with the request since it is
      either malformed or otherwise incorrect. (HTTP 400) (Request-ID:
      req-b0d3e016-9608-4a87-a0cc-44dfe00b25a1)
      $

    After applying this patch:
      $ nova resize-revert test01
      ERROR: Flavor used by the instance could not be found. (HTTP 400)
      (Request-ID: req-ed4ce174-33f2-4258-b522-674a1023ea74)
      $

    Fixes bug 1091490

    Change-Id: I39dd23a7565ae66544e8bc2aa7ad3299eb61bfcc