[nailgun] Squash 5.0.1 and 5.1 migration files

[Evgeniy L]

Squash migration files, 5.0.1 [1] into single 5.1 [2] file.

[1] https://github.com/stackforge/fuel-web/blob/master/nailgun/nailgun/db/migration/alembic_migrations/versions/fuel_5_0_1.py
[2] https://github.com/stackforge/fuel-web/blob/master/nailgun/nailgun/db/migration/alembic_migrations/versions/fuel_5_1.py

In stable release we cannot change migrations because migration process should be rectilinear.
If we had 5.0.1 migration files (in stable/5.0 branch) and 5.1 (in current master), it would be impossible to upgrade from 5.0.1 to 6.0.

5.x upgrades

5.0 -> 5.0.1
5.0 -> 5.1

6.x upgrades

5.1 -> 6.0
5.0.1 ≠> 6.0 because our migration files (master branch) supports only upgrades from 5.0 to 5.1 and from 5.1 to 6.0, and 6.0 knows nothing about 5.0.1

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/106360

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/106360
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=9ea52a54eaccd5e4fb2254c0897d3d6e524745f2
Submitter: Jenkins
Branch: master

commit 9ea52a54eaccd5e4fb2254c0897d3d6e524745f2
Author: Dima Shulyak <email address hidden>
Date: Fri Jul 11 15:30:42 2014 +0300

    Squash 5_0_1 and 5_1 migrations

    Change-Id: Iad237f87d8fe1f22d613a8989ee931108731be9c
    Closes-Bug: #1335088

[Andrey Sledzinskiy (asledzinskiy)]

verified on
{

    "build_id": "2014-09-09_00-01-11",
    "ostf_sha": "f7b5d9d0d1cfaba5f1fe1e2c634493e92bce11db",
    "build_number": "505",
    "auth_required": true,
    "api": "1.0",
    "nailgun_sha": "7683df5722975c1cae48a1a3efdad872b4aaace6",
    "production": "docker",
    "fuelmain_sha": "6cdd8c3deaa5e52806a5c75c4177f3b41d157a22",
    "astute_sha": "b622d9b36dbdd1e03b282b9ee5b7435ba649e711",
    "feature_groups": [
        "mirantis"
    ],
    "release": "5.1",
    "release_versions": {
        "2014.1-5.0": {
            "VERSION": {
                "build_id": "2014-05-27_05-51-41",
                "mirantis": "yes",
                "build_number": "26",
                "ostf_sha": "a8b7660082a6f152794c610d6abe30d360fd577d",
                "nailgun_sha": "bd09f89ef56176f64ad5decd4128933c96cb20f4",
                "production": "docker",
                "api": "1.0",
                "fuelmain_sha": "505741e4f431f85a8d0252fc42754d10c0326c1a",
                "astute_sha": "a7eac46348dc77fc2723c6fcc3dbc66cc1a83152",
                "release": "5.0",
                "fuellib_sha": "2f79c0415159651fc1978d99bd791079d1ae4a06"
            }
        },
        "2014.1.1-5.0.2": {
            "VERSION": {
                "build_id": "2014-09-08_15-45-27",
                "ostf_sha": "2969c1ad443b632e815bb1f01149c3800cd7aa3a",
                "build_number": "71",
                "api": "1.0",
                "nailgun_sha": "c18a21381843dffe807b254a4ff96eec259953cb",
                "production": "docker",
                "fuelmain_sha": "b1e46c8c3ac86a8eafac225507294226322160ea",
                "astute_sha": "6db5f5031b74e67b92fcac1f7998eaa296d68025",
                "feature_groups": [
                    "mirantis"
                ],
                "release": "5.0.2",
                "fuellib_sha": "c891490242d7d88f3c9582cf023e8f2db0b9d337"
            }
        },
        "2014.1.1-5.1": {
            "VERSION": {
                "build_id": "2014-09-09_00-01-11",
                "ostf_sha": "f7b5d9d0d1cfaba5f1fe1e2c634493e92bce11db",
                "build_number": "505",
                "api": "1.0",
                "nailgun_sha": "7683df5722975c1cae48a1a3efdad872b4aaace6",
                "production": "docker",
                "fuelmain_sha": "6cdd8c3deaa5e52806a5c75c4177f3b41d157a22",
                "astute_sha": "b622d9b36dbdd1e03b282b9ee5b7435ba649e711",
                "feature_groups": [
                    "mirantis"
                ],
                "release": "5.1",
                "fuellib_sha": "203ef3179007cffe3236032e61ecbaf1cd20605f"
            }
        }
    },
    "fuellib_sha": "203ef3179007cffe3236032e61ecbaf1cd20605f"

}