Use eval_generate instead of generate

[OpenStack Infra]

https://review.openstack.org/279052
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.

commit 718dabde0a28d60aeca044e03ea8a5c07e771973
Author: Bartosz Kupidura <email address hidden>
Date: Mon Feb 1 11:49:55 2016 +0100

    Use eval_generate instead of generate

    Current override_resources implementation will not create
    all needed dependencies/relationships (before, after, notify,
    subscribe) for new resources (not defined in catalog).

    This fix requires that override_resources MUST
    be used ALWAYS as first resource in manifets.

    We need to put that statement in documentation

    DocImpact

    Change-Id: Id99ddb95c31a7a72dae441b86c55bfaa7c0c44e7
    Closes-Bug: #1538526

[Evgeny Konstantinov (evkonstantinov)]

https://review.fuel-infra.org/#/c/17368/

[Olena Logvinova (ologvinova)]

A note about override_resources as first resource in manifets is now available at http://docs.openstack.org/developer/fuel-docs/userdocs/fuel-user-guide/cli/cli_config_openstack_services_workflow.html.