Add custom graph upload and run support to the Fuel V2 CLI

[OpenStack Infra]

https://review.openstack.org/299306
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.

commit 7a9cd8abec0a238eed4d7234d5d58e83e144fcad
Author: Ilya Kutukov <email address hidden>
Date: Wed Mar 30 14:18:18 2016 +0300

    Add custom graph upload and run support to the Fuel V2 CLI

    Following commands are added:

    * fuel2 graph upload --env env_id [--type graph_type] --file tasks.yaml

    * fuel2 graph upload --release release_id [--type graph_type] --file tasks.yaml

    * fuel2 graph upload --plugin plugin_id [--type graph_type] --file tasks.yaml
      --type is optional. ‘default’ graph type with confirmation should be used
      if no type is defined.

    * fuel2 graph execute --env env_id [--type graph_type] [--node node_ids]
      Graph execution available only for the environment.

    Change-Id: I33b168b7929b10200709efc58fd550f8779b39ae
    Partial-Bug: #1563851
    DocImpact

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