Added fault_tolerance_group to deployment metadata

[OpenStack Infra]

https://review.openstack.org/326088
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.

commit 66b1609df3b3a80a0e9c04ec392a1f4f608601a6
Author: Bulat Gaifullin <email address hidden>
Date: Mon May 30 19:51:18 2016 +0300

    Added fault_tolerance_group to deployment metadata

    This property contains list of groups, that is built from
    tasks with type 'group' and each task may contain property
    fault_tolerance, that shall be moved from openstack.yaml
    to deployment tasks.
    For plugins this attribute is filled from roles_metadata
    for all tasks with type group (for backward compatibility).

    DocImpact
    Partial-Bug: 1435610
    Change-Id: I1969b953eca667c09248a6b67ffee37bfd20f474

[Bug Checker Bot (bug-checker)]

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[Evgeny Konstantinov (evkonstantinov)]

we don't have a deployment tasks file format reference in the docs now. If we need this, we'll create one and add the description there.