remove version.yaml references in fuelmenu

[Matthew Mosesohn]

Fuelmenu still relies on /etc/fuel/version.yaml, which is deprecated. We should refer to /etc/fuel_release to get the current Fuel version.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/250786

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/250786
Committed: https://git.openstack.org/cgit/openstack/fuel-menu/commit/?id=a2f7569adb97d23ba5ac5917ad327065c89ae744
Submitter: Jenkins
Branch: master

commit a2f7569adb97d23ba5ac5917ad327065c89ae744
Author: Matthew Mosesohn <email address hidden>
Date: Fri Nov 27 15:47:29 2015 +0300

    Use fuel_release to get Fuel version

    New function utils.get_fuel_release.

    Consolidated fuel version lookup in fuelmenu.py and
    bootstrapimg to use the same common function.

    Change-Id: I94c8a127fa9c27db352ca76357539816018e9fae
    Closes-Bug: #1520556

[Anastasia Palkina (apalkina)]

Verified on ISO #521

Change version in /etc/fuel_release
Run fuelmenu and check new version.

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "8.0"
  api: "1.0"
  build_number: "521"
  build_id: "521"
  fuel-nailgun_sha: "bae6d0062e0825d81409a04bcb4979302f8c65ea"
  python-fuelclient_sha: "4f234669cfe88a9406f4e438b1e1f74f1ef484a5"
  fuel-agent_sha: "658be72c4b42d3e1436b86ac4567ab914bfb451b"
  fuel-nailgun-agent_sha: "b2bb466fd5bd92da614cdbd819d6999c510ebfb1"
  astute_sha: "b81577a5b7857c4be8748492bae1dec2fa89b446"
  fuel-library_sha: "29829b131ca802830bc5a9a131c83cd0f43f702b"
  fuel-ostf_sha: "7bcddf18020f2d94a553a441ff57dff9632865df"
  fuel-mirror_sha: "c25d8931e30322ecf43246c8a957e376259b685c"
  fuelmenu_sha: "e071216cb214e34b4d861478033425ee6a54a3be"
  shotgun_sha: "63645dea384a37dde5c01d4f8905566978e5d906"
  network-checker_sha: "a43cf96cd9532f10794dce736350bf5bed350e9d"
  fuel-upgrade_sha: "616a7490ec7199f69759e97e42f9b97dfc87e85b"
  fuelmain_sha: "a365f05b903368225da3fea9aa42afc1d50dc9b4"