Upgrade-tempest fail on target. It tries to recreate flavors that already exists.

[Adalberto Medeiros]

When running the target upgrades for devstack from Grizzly to Havana, the upgrade-tempest script produces the following error:
    + [[ -z '' ]]
    + nova flavor-create m1.nano 42 64 0 1
    ERROR: Instance Type with ID 42 already exists. (HTTP 409) (Request-ID: req-5bd3950b-8066-47bc-8f48-ddf510d1ec29)
    + die 276 'Failure in upgrade-tempest'
    + local exitcode=1
    + set +o xtrace
    [ERROR] ./grenade.sh:276 Failure in upgrade-tempest

It seems it tries to recreate the flavors that were already created in the database during the base steps.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/28693

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/28693
Committed: http://github.com/openstack-dev/grenade/commit/4750c7de4edd8d111af34b3b0e5f2d8813ce1b1f
Submitter: Jenkins
Branch: master

commit 4750c7de4edd8d111af34b3b0e5f2d8813ce1b1f
Author: Adalberto Medeiros <email address hidden>
Date: Thu May 9 14:07:21 2013 -0300

    Ensure default flavor is set when upgrading tempest

    Add DEFAULT_INSTANCE_TYPE to upgrade tempest to ensure this is
    set. This avoids recreation of existing flavors when upgrading
    tempest.

    Change-Id: If2e872132939faa4b8afc8dc9b7d7d9aeb026c96
    Fix: Bug 1178028