Exclude possibility that networkx will traverse in different order

[Dima Shulyak]

We need to use dict representation that remembers order in which tasks are inserted

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/165877

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/166141

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/165877
Committed: https://git.openstack.org/cgit/stackforge/fuel-web/commit/?id=7dc2b8bb3ddb4259aeded0d6d036141c3f3812ce
Submitter: Jenkins
Branch: master

commit 7dc2b8bb3ddb4259aeded0d6d036141c3f3812ce
Author: Dmitry Shulyak <email address hidden>
Date: Thu Mar 19 17:17:12 2015 +0200

    Use OrderedDict as data structure for networkx graph

    OrderedDict will preserve order in which tasks are inserted
    and given that fact that json array is structured, and
    tasks found always in same order from directory -
    we will guarantee that order of execution will not be changed,
    even for tasks with same requirements

    Change-Id: I5bc60b9754bb6a8e0d1318848d810603ec7b201e
    Closes-Bug: 1434132

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/166141
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=28e688dfe5d9cd180dc6dee6b7e439d9d1013765
Submitter: Jenkins
Branch: master

commit 28e688dfe5d9cd180dc6dee6b7e439d9d1013765
Author: Dmitry Shulyak <email address hidden>
Date: Fri Mar 20 10:44:04 2015 +0200

    Add ordereddict to nailgun

    We need OrderedDict implementation in python2.6.
    This package is already installed as dependency for another
    nailgun dependency

    Change-Id: I71fa2aa9437e2b4159de0e5dcd15c8dc476c8e2c
    Related-Bug: 1434132