[Fuel Upgrade] Rollback failed - previous version nailgun container wasn't started

[Andrey Sledzinskiy]

Reproduced on fuel-5.1-upgrade-76-2014-07-25_18-23-03.tar

Steps:
1. Install fuel-5.0 - 26
2. Create simple cluster with default values - 1 controller, 1 compute, 1 cinder
3. Deploy cluster
4. After successful deployment upgrade fuel to 5.0.1 with fuel-5.0.1-upgrade-75-2014-07-24_21-23-41.tar
5. After successful upgrade deploy simple cluster with new CentOS release version - 1 controller, 1 compute, 1 cinder
6. After deployment run upgrade to 5.1 with fuel-5.1-upgrade-76-2014-07-25_18-23-03.tar

Expected - fuel is upgraded to 5.1
Actual - upgrade failed, rollback started but after rollback 5.0.1 nailgun container doesn't work

Logs are attached

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/110011

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/110011
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=a20648ab025e24223e708c1dc9512d3e426bc496
Submitter: Jenkins
Branch: master

commit a20648ab025e24223e708c1dc9512d3e426bc496
Author: Evgeniy L <email address hidden>
Date: Mon Jul 28 15:19:06 2014 +0400

    Upgrades, fixed host system upgrader

    Switch /etc/fuel/version.yaml to new
    version when run host system upgrade
    engine because puppet relies on this
    file.

    This change fixes the bug, when user
    runs upgrade several times and puppet
    overwrites supervisor configs for
    previous version.

    Change-Id: I79ff27bb5078d0cf885612af0560b9e1623c6206
    Closes-bug: #1349286

[Andrey Sledzinskiy (asledzinskiy)]

verified on
VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "5.1"
  api: "1.0"
  build_number: "420"
  build_id: "2014-08-10_02-01-17"
  astute_sha: "b52910642d6de941444901b0f20e95ebbcb2b2e9"
  fuellib_sha: "d699fc178559e98cfd7d53b58478b46553ffe39e"
  ostf_sha: "acf52a59e04fa74d2ed2b68ea225f4d24403b264"
  nailgun_sha: "2741cdc0f0615263db2f176899d406207ec4ac04"
  fuelmain_sha: "9d4463400b4924159c978af43855e48bcf2a84b2"