[Upgrades] User cannot skip rollback or checker without upgrade.sh fixing

[Evgeniy L]

Right now if user have some problems with before upgarde checker (for example his nailgun is down and not running) he cannot skip this check as result his env will be broken and he cannot do anything with it.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/105119

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/105119
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=738148b486119a25fe4e3b454597b430363c94db
Submitter: Jenkins
Branch: master

commit 738148b486119a25fe4e3b454597b430363c94db
Author: Evgeniy L <email address hidden>
Date: Mon Jul 7 15:11:06 2014 +0400

    Upgrades, now user can specify --no-rollback or --no-checker parameters

    Closes-bug: #1338538
    blueprint upgrade-to-5-1

    Change-Id: I6663a4f8a66c2519cec2c03002e688b341b2fd51

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/5.0
Review: https://review.openstack.org/105152

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/105152
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=a8a3649b2913ca51c9ca317493dd782f8b0a8acc
Submitter: Jenkins
Branch: stable/5.0

commit a8a3649b2913ca51c9ca317493dd782f8b0a8acc
Author: Evgeniy L <email address hidden>
Date: Mon Jul 7 15:11:06 2014 +0400

    Upgrades, now user can specify --no-rollback or --no-checker parameters

    Closes-bug: #1338538

    blueprint upgrade-to-5-0-1

    Change-Id: I6663a4f8a66c2519cec2c03002e688b341b2fd51

[Andrey Sledzinskiy (asledzinskiy)]

verified on http://mc0n5-msk.msk.mirantis.net/fuelweb-iso/fuel-5.0-upgrade-106-2014-07-08_00-31-14.tar

[Andrey Sledzinskiy (asledzinskiy)]

verified on {

    "build_id": "2014-08-08_11-23-51",
    "ostf_sha": "e33390c275e225d648b36997460dc29b1a3c20ae",
    "build_number": "414",
    "auth_required": true,
    "api": "1.0",
    "nailgun_sha": "5bc33457e5a1f108b071ed0ef2a771ea0b610b22",
    "production": "docker",
    "fuelmain_sha": "16c54168143061724e635a20a99545a756725b49",
    "astute_sha": "b52910642d6de941444901b0f20e95ebbcb2b2e9",
    "feature_groups": [
        "mirantis"
    ],
    "release": "5.1",
    "fuellib_sha": "d699fc178559e98cfd7d53b58478b46553ffe39e"

}