[upgrade] Upgrade failed with Index out of range message

[Tatyanka]

Steps to Reproduce:
1. Deploy 5.0.26 env
2. upload on master node latest master tarball
VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "6.0"
  api: "1.0"
  build_number: "524"
  build_id: "2014-09-23_00-01-46"
  astute_sha: "a3e5da62af91b99f958ab958161d3dcec09c657b"
  fuellib_sha: "5d82d660cdd2dfb6e34bebdfede7ee726e20b131"
  ostf_sha: "27b9a71385934a81bfd30d3556e61bdab3f93933"
  nailgun_sha: "2f4e8fc4e0e8c5d84c56a86308e2ab31efc9aded"
  fuelmain_sha: "bbebf681b52338459074ab2664ea4de2389074de"

3. Run .upgrade.sh

Actual result:

2014-09-24 11:00:03 ERROR 21116 (cli) list index out of range
Traceback (most recent call last):
  File "/var/tmp/upgrade/site-packages/fuel_upgrade/cli.py", line 159, in main
    run_upgrade(parse_args())
  File "/var/tmp/upgrade/site-packages/fuel_upgrade/cli.py", line 133, in run_upgrade
    config = build_config(args.src)
  File "/var/tmp/upgrade/site-packages/fuel_upgrade/config.py", line 87, in build_config
    return Config(config(update_path))
  File "/var/tmp/upgrade/site-packages/fuel_upgrade/config.py", line 635, in config
    host_system = get_host_system(update_path, new_version)
  File "/var/tmp/upgrade/site-packages/fuel_upgrade/config.py", line 198, in get_host_system
    openstack_version = sorted(openstack_versions, reverse=True)[0]
IndexError: list index out of range
==================================================
Upgrade failed

Igor:

[root@nailgun tmp]# ./upgrade.sh
> /var/tmp/upgrade/site-packages/fuel_upgrade/config.py(636)config()
-> host_system = get_host_system(update_path, new_version)
(Pdb) update_path
'/var/tmp/upgrade'
(Pdb) new_version
'6.0'

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/123697

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/123697
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=f7354588ae1be3519d7da245fb9ef453011bd91b
Submitter: Jenkins
Branch: master

commit f7354588ae1be3519d7da245fb9ef453011bd91b
Author: Igor Kalnitsky <email address hidden>
Date: Wed Sep 24 14:31:32 2014 +0300

    Increase OpenStack version in openstack.yaml

    Change-Id: I94835736d3fe07c0dad92ed5c755be57df7d7ff0
    Closes-Bug: #1373376

[Andrey Sledzinskiy (asledzinskiy)]

Issue is also reproduced on 5.1.1 upgrade script

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/5.1
Review: https://review.openstack.org/127942

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/127942
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=b9792cb5bbecddfa9c5c3afb4d0f961a2a2776a7
Submitter: Jenkins
Branch: stable/5.1

commit b9792cb5bbecddfa9c5c3afb4d0f961a2a2776a7
Author: Igor Kalnitsky <email address hidden>
Date: Mon Oct 13 14:50:18 2014 +0300

    Increase OpenStack version in openstack.yaml

    Closes-Bug: #1373376

    Change-Id: I94835736d3fe07c0dad92ed5c755be57df7d7ff0

[Andrey Sledzinskiy (asledzinskiy)]

verified on {

    "build_id": "2014-12-17_03-38-09",
    "ostf_sha": "a9afb68710d809570460c29d6c3293219d3624d4",
    "build_number": "50",
    "auth_required": true,
    "api": "1.0",
    "nailgun_sha": "dc621c96e30f0dd284998e975f3b800afe9fc082",
    "production": "docker",
    "fuelmain_sha": "fb89876812320464ebad60e7ca34b433d6b1d815",
    "astute_sha": "16b252d93be6aaa73030b8100cf8c5ca6a970a91",
    "feature_groups": [
        "mirantis"
    ],
    "release": "6.0",
    "release_versions": {
        "2014.1.3-5.1.1": {
            "VERSION": {
                "build_id": "2014-12-03_01-07-36",
                "ostf_sha": "64cb59c681658a7a55cc2c09d079072a41beb346",
                "build_number": "48",
                "api": "1.0",
                "nailgun_sha": "500e36d08a45dbb389bf2bd97673d9bff48ee84d",
                "production": "docker",
                "fuelmain_sha": "7626c5aeedcde77ad22fc081c25768944697d404",
                "astute_sha": "ef8aa0fd0e3ce20709612906f1f0551b5682a6ce",
                "feature_groups": [
                    "mirantis"
                ],
                "release": "5.1.1",
                "fuellib_sha": "a3043477337b4a0a8fd166dc83d6cd5d504f5da8"
            }
        },
        "2014.2-6.0": {
            "VERSION": {
                "build_id": "2014-12-17_03-38-09",
                "ostf_sha": "a9afb68710d809570460c29d6c3293219d3624d4",
                "build_number": "50",
                "api": "1.0",
                "nailgun_sha": "dc621c96e30f0dd284998e975f3b800afe9fc082",
                "production": "docker",
                "fuelmain_sha": "fb89876812320464ebad60e7ca34b433d6b1d815",
                "astute_sha": "16b252d93be6aaa73030b8100cf8c5ca6a970a91",
                "feature_groups": [
                    "mirantis"
                ],
                "release": "6.0",
                "fuellib_sha": "484f53f586c084cc38c88615b0594d9c48882c5a"
            }
        }
    },
    "fuellib_sha": "484f53f586c084cc38c88615b0594d9c48882c5a"

}