Command `fuel2 graph execute` should return a json with task description

[Alexander Kurenyshev]

Steps to reproduce:
Go to the CLI and try to do:
[root@nailgun ~]# fuel2 graph execute --env 1 -t my_graph --json

Expected result:
The command returns a valid json with task description, when I use the '--json' flag
Actual result:
usage: fuel2 graph execute [-h] -e ENV [-t TYPES [TYPES ...]]
                           [-n NODES [NODES ...]]
                           [-T TASK_NAMES [TASK_NAMES ...]] [-d] [-f] [--noop]
fuel2 graph execute: error: unrecognized arguments: --json

Fuel snapshot:
http://mirror.fuel-infra.org/mos-repos/centos/mos9.0-centos7/snapshots/proposed-2016-09-13-092323/

[root@nailgun ~]# shotgun2 short-report
cat /etc/fuel_build_id:
 495
cat /etc/fuel_build_number:
 495
cat /etc/fuel_release:
 9.0
cat /etc/fuel_openstack_version:
 mitaka-9.0
rpm -qa | egrep 'fuel|astute|network-checker|nailgun|packetary|shotgun':
 python-fuelclient-9.0.0-1.mos350.noarch
 fuelmenu-9.0.0-1.mos275.noarch
 fuel-ostf-9.0.0-1.mos944.noarch
 fuel-nailgun-9.0.0-1.mos8835.noarch
 fuel-9.0.0-1.mos6355.noarch
 fuel-migrate-9.0.0-1.mos8586.noarch
 shotgun-9.0.0-1.mos90.noarch
 rubygem-astute-9.0.0-1.mos766.noarch
 fuel-library9.0-9.0.0-1.mos8586.noarch
 fuel-provisioning-scripts-9.0.0-1.mos8835.noarch
 fuel-ui-9.0.0-1.mos2805.noarch
 fuel-openstack-metadata-9.0.0-1.mos8835.noarch
 network-checker-9.0.0-1.mos74.x86_64
 fuel-utils-9.0.0-1.mos8586.noarch
 fuel-release-9.0.0-1.mos6355.noarch
 fuel-agent-9.0.0-1.mos290.noarch
 python-packetary-9.0.0-1.mos149.noarch
 fuel-bootstrap-cli-9.0.0-1.mos290.noarch
 fuel-setup-9.0.0-1.mos6355.noarch
 fuel-notify-9.0.0-1.mos8586.noarch
 fuel-mirror-9.0.0-1.mos149.noarch
 nailgun-mcagents-9.0.0-1.mos766.noarch
 fuel-misc-9.0.0-1.mos8586.noarch

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/370042

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/370042
Committed: https://git.openstack.org/cgit/openstack/python-fuelclient/commit/?id=1c6cd3524ea7868429e7a4fdc4ab783dda8a9539
Submitter: Jenkins
Branch: master

commit 1c6cd3524ea7868429e7a4fdc4ab783dda8a9539
Author: Bulat Gaifullin <email address hidden>
Date: Wed Sep 14 14:15:12 2016 +0300

    Added option to command execute for specifying output format

    New option 'format' for commands 'graph execute' and
    'sequence execute' will allow to specify the expected
    format of output: json or yaml.
    By default the text message will be produced.

    Change-Id: I68be70bf317ea9fe4c0197073bd5dd41c3ba9d32
    Closes-Bug: 1623014

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/371463

[Dmitry Belyaninov (dbelyaninov)]

https://product-ci.infra.mirantis.net/job/10.0.system_test.ubuntu.graph_extension/6/testReport/(root)/graph_extension_cli/graph_extension_cli/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/371463
Committed: https://git.openstack.org/cgit/openstack/python-fuelclient/commit/?id=dee09cc42179c02bea54b4dee35238fc8c5bcf54
Submitter: Jenkins
Branch: stable/mitaka

commit dee09cc42179c02bea54b4dee35238fc8c5bcf54
Author: Bulat Gaifullin <email address hidden>
Date: Wed Sep 14 14:15:12 2016 +0300

    Added option to command execute for specifying output format

    New option 'format' for commands 'graph execute' and
    'sequence execute' will allow to specify the expected
    format of output: json or yaml.
    By default the text message will be produced.

    Change-Id: I68be70bf317ea9fe4c0197073bd5dd41c3ba9d32
    Closes-Bug: 1623014
    (cherry picked from commit 1c6cd3524ea7868429e7a4fdc4ab783dda8a9539)

[TatyanaGladysheva (tgladysheva)]

Verified on 9.2 snapshot #666.

Actual results:
http://paste.openstack.org/show/593226/