Ubuntu installer can't be loaded after upgrading to 6.0 from 5.1

[Ihor Kalnytskyi]

Not long time ago we have removed `fuelweb` word from our repo paths, but when we do upgrade we already have old repos with that word.

Due to another bug, we use old installer with new repos, and we fail because cobbler knows nothing about 'fuelweb' word and try to load installer from ubuntu/x86_64. So we need to make a symlink during upgrade process.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/133280

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/133280
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=35465343247c7c9733e411170c89619ae1393da3
Submitter: Jenkins
Branch: master

commit 35465343247c7c9733e411170c89619ae1393da3
Author: Igor Kalnitsky <email address hidden>
Date: Fri Nov 7 18:00:30 2014 +0200

    fuel_upgrade: add hack to make repo symlink

    We need to add next symlink

        repo/ubuntu/x86_64 -> repo/ubuntu/fuelweb/x86_64

    in order to get working upgrade to 6.0, because in 6.0 we know nothing
    about 'fuelweb' folder in repo struct, but we have it in old repos from
    previous installation.

    Change-Id: I7985a1f64b54bfff84df7098252448ea6ec6b613
    Closes-Bug: #1390521

[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"

}